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It can be a number of things timing, fuel sensor, dirty throttle body or carb linkage depending what kind of engine and system you have. A dirty air filter a bad o2 sensor so many things. or you might have the idle up too high. Clean the carb or throttle body, tune up the car change all your filters if they are due. Check the troubble shooting guide in a chiltons or haynes if you have it. They do idle high until they warm up mabey your kick down linkage is dirty. and see if your choke is stuck if you have a carb. Good Luck.
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