when i come to a complete stop, my car starts to idle a little funny. the rpm needle goes up and down about 200 rpms and it sounds like the engine is reving a little. anyone know what this could be?

my friends does it worse. his car idles up and down like 12-1500 rpm. any suggestions?

93hb

 

Maybe an o2 sensor? Maybe.

 

tried checking obd for engine codes?

 

my check engine light is one and it is the primary o2 sensor for my car that is bad. would that cause it to idle up down by 200 rpms or so?

my friends car doesn't have a check engine light on and his idles nasty. it goes up and down about 1200-1500 rpms. when he starts the car, the rpms go all the way up to 3500, then you have to tap on the gas so the rpms will drop.

93hb

 

Could be the iac sensor is clogged.

 

Don't forget the possiblity of a vacuum leak. This was what mine did when I had a leak around my supercharger.

Shawn