Hesitation when excelerating

I would think that maybe you fuel regulator or injector o-rings are in need of replacement. a long shot might be your coils is on its way out. hope this helps and best of luck.

Agreed, something is causing a rich mixture which is exacerbated by the need for extra fuel on acceleration. Have it checked for fuel pressure, have plugs pulled and checked, check coil, etc. Ask mechanic to check throttle position sensor and see if the ECM is working properly.

Same problem here, I noticed that it goes away once the car has reached its normal operating temperature. Is the heavy gas smell is only noticable in colder weather? That is normal. Are you running 91 Octane fuel? Have you ever cleaned the carbon buildup off the interior of the throttle body? Is your air filter clean? Is this happening when you hit the "magic button" under the gas pedal? Does the car immediately downshift?

Had same problem a few years back - Faulty spark plug wire was the problem - at low speeds you don't notice a cylinder not firing - when you accelerate that is when you feel the loss of the cylinder - have them either checked or replaced

More than likely it's your fuel pump. Happened to mine. Previous owners didn't change it, I did at 133K and it was mush. After replacing ECU, the throttle position sensor, replace plugs and wires, coils, and water pump, it's good for another 200,000 miles.

So someone accidentally hooked my battery up wrong. Got the battery replaced correctly and also rebuilt the alternator. Now my car will not accelerate like it should. Could I somehow flooded my car. In which now I need to change my spark plugs... Any suggestions would help before I spend money on something that isnt resourceful to my needs at this moment... Note before the battery went dead and was put back in incorrectly. The car was running like it was brand new.. Also it is a Lexus ls400 1997... Any help please????

Nice answers. It is a thermostat of some sort. It can be all these above, except the Fuel Pump, not even close. Have them put it on the machine and I am pretty sure this is a thermostat issue, confusing the ECU

I change my spark plugs in my fuel pump in my car still doesn't start I doesn't I think it's the starter cuz it cranks what's wrong with my car

Try the Yaw sensor. I just had mine replaced for similar reason. I hope it is the problem.

Hi im struggling with a Ls400 non vvti lexus v8 start fing run nice but when driving after about 14 km it loose power and wont rev right. Then while the car is freeing i switch of the ign and emediatly on and it fine rev smooth and the in a while its doing it again any help please?

Ok so mine is doing the same thing won't take fuel revs cuts out backfires no check engine light smells like raw fuel plz help me as I can't figure this out!