My 00 se idles rough when warm. Over the last few months I replaced all 6 coils (solved my P030x problem), cleaned my TB (removed and thoroughly cleaned), replaced my MAF, but still my car misfires at warm idle. When I start the car in the morning, I don't usually have a problem for about 10 minutes. I do not have an appreciable loss in gas mileage or power.

The only thing I can think of is maybe my Idle Air Controller is faulty. Does anyone else's car exhibit the same symptoms? Has anyone needed to replace the IAC? Perhaps there is another cause for this problem?

Thanks in advance...

 

Just posting again to get this to top of list...Does anyone have comments or thoughts on my problem?

 

WHat kind of spark plugs do you have and are they gapped correctly? You should only use NGK plugs for hte VQ.

 

I do have NGK plugs, and gapped them correctly. This was done with the coil replacement.