Does your idle rise and fall over and over again? Does your ‘Stang stall when you come to a stop, or even when you put it in gear? It guess it’s time for a new IAC (idle air control, or as it’s sometimes called, idle air bypass)… or is it?
Fuel injected Mustangs use a small motor/valve assembly that allows a certain amount of air to bypass the throttle plate, entering the engine to control idle. As mileage increases dirt, air filter oil, and carbon build-up will take it’s toll and often cause idle surging and stalling. This can happen as early as 30,000 miles depending on conditions (K&N’s really speed up the process). Why replace it when you can clean it?