1G Idle problem after warming up

[Hahvetc]

hen i start my car it idles @ 1100 (to warm up) then it drops down to 900-800 range. After i drive for 20-30 minutes the idle is @ 1100-2000. At a stop light it does not change. I can rev it up and it will just drop back to where it was. Sometimes it seems where i let the clutch put the idle stays there. Please Help it is getting very annoying. Yesterday i tested my isc and all the coils read.

 

[rebuilt_gsx]

Could it be your TPS?

 

[CoryJNason]

is the throttle cable getting stuck on something?

 

[turbogentwo]

Sounds a lot like the throttle cable getting stuck or the flapper is catching. When it happens again, go to the throttle body and help close the plate with your hand (be careful it gets hot) if it changes the rpm then its either the plate or the cable..most likely the cable isn't adjusted properly.

 

[Twoslow]

Sounds like you have a vacume leak. Try using some carb cleaner while the engine is running to locate it. Engine will speed up when u find the right spot