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I need a little more information on this one. Do you mean that the engine RPM suddenly increases after being at a normal idle? Or do you mean that the engine will not idle down? If the engine RPM will not slow to a normal idle (somewhere between 500 and 700 RPM) I'd check for vacuum leaks. Start with the EGR valve. Make sure the gasket is in place and the EGR valve is installed and tightened. Also check the throttle body and make certain that it is properly tightened. If the engine suddenly races while idling, I'd check the mechanism that increases idle speed when the AC kicks on. If it is improperly adjusted you could have a problem. I'll watch this post and if you have any more concerns, write a clarifying question.

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โˆ™ 2005-09-12 16:23:31
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Q: Why does a 1992 cop car caprice accellerate at stop sign with no cruise control?
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