Got a Real Big Problem

[Tankengine]

Hey Guys, long time no see, i havent been here lately, been very busy, turned my grand am back to stock since now i have a family and all, no JL W7 required in the trunk!

anyways i got a big problem
something is wrong my engine and i dont know what it is, this is what happens, when i am idling at a light, my car revs at 900 rpm and it drops to 600 rpms when i shift into neutral, lately when im driving my car jerks and then all of a sudden my car is reving at 1500 when i idle and if i drop it into neutral it revs at 2500 rpm non stop, and when i put it back the rpms drop to 1500 but if i let go of the gas...BOOM my car starts to fly and it passes 20 km a hour by itself without touching the gas,

what i do to "fix" my problem is while im driving i pop it into neutral and turn the car of and on, then it start to idle normally,


i have no idea what the problem is or what its called,

i relaly could use some help
thanks guys

[2Dambad]

Sounds like a throttle position sensor gone bad. Not a really hard fix. IIRC, it is located behind the throttle body. 2 Torx screws and a plug in electrical connector hold it in place.

[Irate]

Yeah, check your TPS and your throttle cable for sticking.

[fishhunter911]

or it could be the IAC motor ( Idle Air Control Motor) might be stuck open with carbon

[Tankengine]

great thanks a million guys

[Dr_Kyle]

Same thing happened to me. I cleaned the IAC and the IAC port on the TB and it solved the problem.

[Rogue9]

how'd u clean the IAC?
what chemicals, etc.

[Dr_Kyle]

I just used throttle/carb cleaner and a rag. I used a LOT of it in the TB.

[-Wild Joker-]

How did you take apart the IAC? Where is it?

[Dr_Kyle]

Search and you'll find the answer. I've even posted a picture of it.

[AznGA]

Search and you'll find the answer. I've even posted a picture of it.
Do you remember the title of it?