1999 V6 idle surging issue


New Member
I'm having issues with the idle on my 99 coupe. It will jump anywhere from 800 to 1200 rpms when driving or slowing down to a stop. I've replaced or cleaned all of the parts they may cause this but the problem is still there. ( Replaced the IAC, TPS and MAF sensor. Cleaned the throttle body and EGR valve. Checked for vacuum leaks...) Also the gas mileage is very poor.

Anybody have any ideas or suggestions?