2004 chevy impala, rough idle
Asked by Jeff Jul 04, 2016 at 02:07 PM about the 2004 Chevrolet Impala LS FWD
Question type: Maintenance & Repair
I have a 2014 chevy impala. It has started with this
rough idle here lately. And while driving it will jerk a
little. And during acceleration it seems to hesitate
and jerk a little bit. I've replaced the plugs, wires,
fuel filter, fuel pump, crank shaft position sensor,
mass air flow sensor and I don't hear a vacuum
leak. Any suggestions on this would be greatly
appreciated. Thank you.
5 Answers
It's a 2004. The problem has been going on for about 2 weeks. The check engine light came on. Had it scanned. 0455, evap leak large. So replaced the cap and the vent solenoid. And the light went off. But it still has the rough idle. Don't want to keep replacing parts blind. What about the purge valve or the throttle position sensor
Just changed the purge valve. No difference. I guess I need a smoke test on the vacuum lines. I don't hear any hissing. I'm stumped.
And thank you for the help.
Jerryakashrek answered 7 years ago
I have an 03 impala and it's exhibiting the exact same symptoms it's a rebuilt trans with about 5k miles and the motor has about 114k it was running just fine till a few days ago I did recently cut the cat and straight pipe it so idk if that has anything to do with it
