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I am not exactly sure of what you are asking, from the wording you are using. In any event as you posted under Cars & Vehicles, I believe you are asking something about and IAC or IAC trouble...
it is behind the Throttle Body. It will have 3 wires.
This image shows throttle body, so look behind it
http://img65.imageshack.us/img65/7821/car2r.jpg
the iac is part of the throttle body..If your car dies when you turn the ac on, you need to clean your throttle body with some cleaner. Sounds far fetched, but this will solve the problem