Not every time but occasionally while driving and i stop at a light, I'll shift into neutral and It will Idle at around 2500 RPM's. But in my driveway before i take off somewhere it idles around less than 1000. But when in route somewhere and i go to neutral it will idle extremely high and go up and down in RPM's. I have a 97 GT. I have no idea what's going on and looking for some help. Thanks in advance.

 

allot of ppl will say TPS (throttel position sense.) but really ive replaced it on mine an diddnt notice a difference--but my rpm just fall slowly

 

sometimes it will fall slowly on its own but usually it just stays constantly hgh. thanks for your help tho.

 

IAC valve?

 

when it does this again try reving it up all the way then see what happens--or try shutting the car off wait a sec then start it back up---

 

I've done both of those and it does work...I was just trying to find a way to fix this perminently if there is a way, if there isn't a way then i will be able to survive with these quick fixes...Thanks.

 

+1 for cleaning the IAC