Idling problem

[pkmcguin]

I have a 1998 Sonoma and have a idling problem at 900 RPM drops to 800RPM when warm. Flutters back and forth.

I have replaced EGR, TPS switch and AC138 valve. Used fuel injection cleaner and replaced one vacuum hose.

Any suggestions/recommendations to find this problem? Thanks Paul

 

[Molson02536]

I have a 1998 Sonoma and have a idling problem at 900 RPM drops to 800RPM when warm. Flutters back and forth.

I have replaced EGR, TPS switch and AC138 valve. Used fuel injection cleaner and replaced one vacuum hose.

Any suggestions/recommendations to find this problem? Thanks Paul

Your idle is controlled by your ECM from readings from your engine sensors. Recheck all your vacuum lines and clean your throttle body paying attenion to your IAC valve. A bad PVC valve can also cause your engine to flutter back ad forth. Try using http://www.seafoamsales.com/, just follow the instructions on the bottle to clean out carbon deposits in your engine.

Keep us posted and good luck

Molson02536