Power wash your engine, so that you can physically see things. Look for broken or leaking rubber vacuum hoses. If you cannot find any, buy a can of Gum-out, and spray clean your throttle body, and throttle plate, Also the idle air control valve, which is electrical and run by CPU. Also,check your throttle cable for bends or restricitions. Replace if necessary with new cable that doesn't bind up. Good Luck!
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