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In my experience, when the IAC is dirty the idle is slow to respond or unresponsive. As in idles too high or the engine dies at idle because it is too low. The IAC is just a tapered plunger that plugs and unplugs a by-pass hole in the throttle body that allows more or less air into the engine.
It doesn't usually cause a rough running idle condition, unless it causes an extremely low idle that causes the engine to shake.
I usually spray carb cleaner in it and let it soak for awhile and then spray it again. Be sure to remove the gasket/seal first.
I agree as a dirty IAC wont cause a rough idle just a slow or fast idle. My question is does it feel like a dead miss or more like a vibration but still hitting on all 4 cylinders ? Ron
Last edited by 383man; 06/16/14 03:59 AM.
