Hey all, I have an idling problem, When my car has warmed up by being drivin for about 20 min, out of no where it starts to idle weird when im at a stop light (car is auto and it does this in Drive or Park). The idles jumps down to 350 RPM then moves up to 750 RPM and keeps doing this every time but sometimes it takes it like 5 sec then it does it then idles normal again for 5 sec then does it again, but the car runs very strong when im driving and has good power.

First i thought it was the TP sensor because i recently replaced that, so i checked the voltage and it was way off so i set it back to the factory settings which is 0.5V at closed throttle. So that didn't help anything

I checked for vacuum leaks and everything is fine there

Now im thinking it might be the O2 Sensor because the car use to give me code 43 before i fixed the TP sensor but now the ecu gives me nothing at all.

Or im thinking it might be the IAC but when i unplug the sensor from it the car turns off as it should so im thinking it cant be that.

Or i just could need to raise my idling screw a bit (maybe i should try that first right?)

 

Bump

 

check your gaskets.....especially the ones for the spark plugs, oil on plugs can cause idle fluctuation

 

http://www.g2ic.com/forums/sho...oting