A vacuum leak can cause this problem. Many mechanics will start the engine and spray starting fluid around the vacuum hoses. If there is a leak, the RPM's will raise. However, I avoid doing this because starting fluid can cause a fire if it hits something that is hot enough. If you try it, make sure to have a fire extinguisher near by.
Next, I can't remember if your car is fuel injected or has a carborator. It has been a while and around 1987 is when they all started changing. Let me know that. Also, check for an idle adjusting screw where the throttle is located on the carb or TB.
Let me know what you find.
Joe
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Monday, December 14th, 2009 AT 10:38 PM