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try changing your TPS (throttle positioning sensor) its located on the intake area (look where the throttle cable hooks to the engine) Possibility of a fuel pressure regulator problem. Also a faulty Idle Air Control motor (IAC) could cause the problem. ask a local repair facility for assistance. I had that problem with my grand prix. Replaced everything I could think of. turned out to be that the computer needed to be reset. possibly a vacuum leak...check hoses, you may need to replace you intake maniflod gasket

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โˆ™ 2006-04-11 10:00:40
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Q: Why would a car idle rev up and down?
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