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Well, my IAC just went bad on my ZX2. I've been having stalling problems for about a year intermittently but it started getting really bad. When the car is driving its fine, but when I stop at a light it completely stalls. It will start right back up but only stays running if I give it gas. I took it to a mechanic who ran a diagnostic. Even though the check engine light wasnt on he was able to tell that the IAC is bad. The part is $180 and the labor is about .5 hours. Hope this helps!

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Q: How do you know when the idle air control is bad?
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