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the 84 uses an idle air control valve to control idle speed. this is a function done by the computer. if the idle is too low when cold but runs ok when hot, or ok when cold but then too high when hot, then chances are your idle air control valve is bad. if the idle is high all the time, you probably have your pcv valve vacuum line disconnected. if your brakes seem very hard to push as well, then it's probably your brake booster vacuum line. if neither of those, look for other vacuum hoses that may be disconnected. there is no user adjustable idle speed control for that car.
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∙ 16y ago
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