Alright. I noticed this yesterday, but it did it today too.

When the car is halfway warmed up (according to the water temp gauge) and I am idling at a stoplight or something, the idle goes between 900 and 1100 RPM. other than that the car runs fine. doesn't do it when it's warm, doesn't do it when I just start it. so, I'm confused.

Also, lately it's been REALLY cold if that's a factor.

one last thing, sometimes (once or twice) when I start it in the morning and let it heat up while I'm de-icing the windshield, for a couple seconds after running a bit, it'll not fire in a cylinder, then go back to a solid idle. what could cause this? doesn't happen every time.

Thanks for the advice. I'll buy each of you a beer sometime

 

Check the adjustment on your speed and reference sensors.

How old are the spark plug wires?

 

not too old...

 

Idle Stabilizer Valve?

 

someone told me about three months ago it was the auxiliary air valve and the throttle positioning sensor. im having the same problem with my car, before i put the new tps on, it would rev all the way up to 1800 as its "normal" idle. then start bouncing around again. then i read that its the adjustment on the tps, then i was told its not, and i cant find where i read about the adjustments. so hopefully youll get some answers that i can steal.

 

K. mine's not too bad. just between 800 and 1200 and it only happens when it's halfway warmed up according to the coolant temp gauge