Ford Repair Questions? Ask a Mechanic for Answers ASAP
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Lets do a throttle body cleaning by using a tooth brush and carb cleaner while holding the throttle wide open with the vehicle off. Now pull the negative battery cable for 10 minutes to give the computer a reset. If it still does this then you have yet another faulty idle air control valve or a concern with a PCV hose or vacuum hose leaking allowing air to enter the intake from a source other than the air filter. Common vacuum leaks occur around the passenger valve cover area. You can also find leaks by idleing the engine and spraying shorts bursts of the carb cleaner around the intake and vacuum hoses. When a leak is hit the idle will increase.