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07-21-2011
We have got a 97 grand prix that has been an excellent car until now. When starting it up-the idle is rough, right around 1000 rpm. Going down the road the rpm will continue to rise on its own and will not come down-creating the car to accelerate, creating a dangerous situation. When put in neutral it will rev very high. I dont think that the throttle is sticking, but thats what it acts like. Any suggestions. Thanks in advance.
07-21-2011
A scanner would be great. Most likely it's a TPS sensor, but it could also be an IAC soleniod.
07-21-2011
Maybe a vacuum leak? Check all your vacuum lines and listen for a sucking sound.
07-21-2011
found the problem. vacuum leak where a line plugs into the front of the throttle body. Dry rotted line. Thanks
07-22-2011
Hoooooooooray vacuum leaks!
07-22-2011
^ exactly could have been more expensive to fix than that,be glad friend be glad.Originally Posted by matt5112
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