OK, so my car will start no problem and idling fine when it's cold. But when I stop at a light after it has warmed up it starts to idle roughly. The RPM's are right around 750, but do not change when it is idling roughly. It will also hesitate if I try and accelerate too quickly. It almost feels like a backfiring, but without the sounds. Please let me know if there are any thoughts out there about what it could be. If you need more info, let me know.

 

When was the last time you did a complete ignition tune up and have you ever done a throttle body/EGR prort cleaning?

There is a lot of information about tune ups and throttle body, EGR, IAC and FIT valve cleaning in the FAQ.

 

Do a search on FITV, and IACV