STUMBLING PROBLEM

check your spark plugs your mechanic ripped you off check your magneto or sparplugs mostlikely case

something mite be wrong with timing i herd something like that in a camry

Right after your engine air filter is your MAF (mass air flow) sensor. There may or may not be a screen in front of it, but there will be a wire running across the middle of the opening. Spray that down with either Brake Clean, or Carb/Choke Clean and see if that helps. If there is any dirt, oil, water on the MAF it will cause your issue and not set a code. What you had going on with the EGR system was probably not related to this issue, but would affect your emissions.

I owned an crown vic interceptor which had the exact problem. It would "stumble" sometimes at idle or like you said, pulling out. Normally I would gas it to overcome the stumbling up to 10mph or so. I did what the others said, changed the spark plugs, plug wires, cleaned the MAF, changed the EGR, everything. I still had the problem. After further inspection of the throttle body, it seemed the catch where the diaphragm would stop the valve travel was gapped too much. I placed a small rubber cap on the stop, adding approx 1/32, then the problem stopped. Without applying gas pedal pressure the throttle body "should" maintain proper idle. For some reason our cars were notorious for stumbling. I know it sounds like jerry rigging but its effective. But I always suspected one other thing, the coil packs. You have two of them, and I have heard sometimes they lose idle charge capacity which would produce improper spark, thus also creating the stumbling. It is an easy install at 40.00 a piece and also replace the small side capaciters attached to them. Hope this helps and respond to me if you need further help.

I am about to purchase an 03 PI from a family member. It Runs great untill u put u put ur foot into it. soft acceleration its ok. hard acceleration is bogs down. fuel filter changed.. MAF? TIA!

I had the exact same problem. Your answer is here.. You need a new idle air control valve. They get gummed up around 100k or more. Replaced mine and never had a problem since. If your vic starts and stalls and sputters its definitely the idle air control valve on the throttle body. Good luck!

Most definitely the idle air control valve!

They may have broke the flare some at the exhaust manifold egr tube connecter with the vavle change. Also does you mib blink during rapid acceleration from say 35 to 70 if so it could be time to replace the intake manifold.

If the MIL blinks, it is an indication of a misfire, not an intake manifold. The Intakes on these break and leak coolant - they do not cause misfires - broken Spark Plugs, internally shorted Coil Packs and old Spark Plug Boots do that. A broken flare on an EGR tube will only leak exhaust and will be quite audible with the hood up. Bogs down on acceleration? Retrieve the codes, Watch the PIDS and actually see what is performing outside of the normal parameters - or throw a ton of money at it until you get lucky. (Shotgun Repair Method)

I have an 2005 crown vic p71 what will ny car do if it needs an intake

Idle air control valve, easy to install, retails for about $50. Had a local shop quote $600 to do the job. Ran as fast as I could and did it myself. No special tools required. This is the fix provided you are only experiencing the problem at or near idle. If the problem occurs at normal running speeds then coil packs or even fuel system...

I replaced my TBS, IAC , vapor canister and canister soleniod... Vehicle still stallls randomley, mostly when slowing down and turning into a parking space or side street..... Next try for the weekend is throttle bottle cleaning and or fuel filter replacement... Also im getting a gas smell and a CEL Code for a bad black box canister even after i replaced it.. Any ideas? (2001 Grand Marquis 4.6L)

I have an 2001 grand marquis when I drive it for about 10 to 15 minutes my temperature gauge light will come on and my check engine light will get brighter and kinda stalls. I changed my mass air flow sensor and my o2 sensor. Sometimes my car will just die please someone help meee!!!!!

My fix for a 2000 Crown Victoria had a stumbling feeling when I was lightly accelerating. The fix was simple! I took starter fluid that would clean and dry itself. I opened the top of the air cleaner box and sprayed the sensor until it seemed clean. The cars computer sensed the air mixture was incorrect at the most sensitive acceleration and fuel mix and has been perfect ever since. It lights up the tires from a stop. No stumble any more.

I have a question I have a 2001 Ford crown Vic p71 with 102000 miles it has new intake tps sensor idle air control valve gas tank fuel filter air filter all coils tranny fluid change oils change and only on super light throttle going about 40 it misses and I can't figure out what it is Also has new o2 sensors

Hello, I own a 1989 Crown Victoria and had a stumbling problem as well. It sounds a lot like your problem; shaking and stumbling on light acceleration, but it's perfectly fine at high speeds. after working on the car for days, narrowing down what the problem might be, I eventually got down to a bad spark plug. Of course, the one that was bad was the hardest one to reach, all the way in the back on the passenger side. Once I replaced it, it ran perfectly. and If it's of any relevence, here's all the other parts of significance I replaced or done to the car: cap & rotor, spark plug wires, oil filter, an exhaust gasket, treated the fuel, replaced power steering fluid. After all that was done, it ran like new, but only behaved properly after the gunked up spark plug was replaced. Hope this helps some!

I have a 2001 crown Vic Police interceptor it does a miner stall at 50 I've changed spark plugs trans strainer o2 senser filters and it still do the same need help

Is the CEL on maverick? The coils on these engines can go out and cause a bad miss.

Yes it's on

I have a police interceptor '06 crown vic, ive replaced spark plugs changed oil filter, gas treatment, check engine light still on and engine knocking, any suggestions to make it run like new?

If your intake is cracked it will cause your car to mis fire because coolant pools in the spark plug holes. Mine had one that was full of coolant. Now it's missing and dying intermittently. I am going to replace the IAC valve.

Had the same problem with my 99 Vic pi. If you lightly push the peddle it kind of stuttered even at high speeds if you left off the peddle and lightly push it it would stutter and at low speed sometimes stall out it ended up being the coil over the back driver plug had a hole in it I replaced it and plugs and she runs perfectly now

Sounds to me like a misfire. Plugs and boots should do it. Dielectric grease is your friend. Goo the crap out of those boots. It keeps moisture out and makes it easier to take the boot off for the next plug change. A good thorough cleaning if your intake is always a good and cheap thing to do. (May not be related but do it anyway. After you have cleaned and tuned that puppy, reset the computer. Not the idiot light actually reset the computer. There are tutorials on line.

I have no IAC valve on my 2005 Crown Vic Police Interceptor. However, I suffered the same stuttering at light pedal pressure and at highway cruising speed when I tried to accelerate. Replaced fuel filter, plugs, coils & boots are good, cleaned MAF and throttle body. Still stuttered. Added Lucas gas treatment and problem solved. I do not work for Lucas and know no one who does. This is an unbiased report.

Its the transmission!!!

allways is tranny in those chasis not an engine problem

Watch this video to repair this problem https://youtu.be/a6GSgMLTHYc

I have a 2003 crown victoria, LX Sport. This thing started acting crazy and have a hard time with acceleration when trying to get on the freeway. Popped the CEL, blinking, which I immediately knew was a misfire issue. Coincidentally it was misfiring on 3, 6 and first 1000RPMs at startup. Pulled the plugs on both and found out someone put in NGK plugs. I only use Motorcraft myself so I replaced them both and replaced both COPs with spares (probably junk IMO). Unfortunately that didn't solve the issue, it solved the misfire on startup and on cylinder 3, but 6 kept acting up and misfiring when I would give it pedal to the floor trying to accelerate on the freeway. I decided to replace the #6 COP with one straight from the dealership, however, car is still hesitant, not as bad, but still hesitant. No more CEL and no codes anymore.. I'm thinking I just need to replace the plugs on all the rest and invest in the factory COPs in order to fix this for good. Any help would be appreciated

My 99 crown vic stumbles at 45 mph when going up a hill. this happened to me once before and it was the lockup torque converter bad!