What is wrong with it?

[jbs986]

Originally Posted by ProjectM96

Update on rough idle problem: I cleaned the Idle Control Valve and Throttle Body. Before reinstalling them, I checked again for vacuum leaks since I had better access to the hoses. All hoses are in good condition seem to be aging well.

I know it is not the coils or spark plugs. I know it is not the ICV/Throttle Body. I know it is not a head gasket. Mechanic says it is not a vacuum leak and I could not find a vacuum leak using various methods.

Last possible thing I can think of that causes a rough idle is the MAF sensor, but it still does not make sense because a MAF sensor is supposed to cause a CEL and I do not have a CEL light On. Plus, my scanner says no codes found. Anyways, I will try to clean it and reinstall it when I buy MAF cleaner.

Can you guys think of anything else that causes rough idle?

Yes my 2002 had the same problem that you are describing, it turned out to be the idler control. car runs fine now.