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Magoo—2012 Cadillac CTS Luxury, Opulent Blue, plus many more, see signature.
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Try cleaning the IAC and the passages to it first. Usually, the thing is covered with carbon and the passages to it are clogged with carbon buildup. It's rare to have one completely fail.

Handle the plunger end of the IAC gently. I've broken a couple of them off trying to get them clean, and then you do have to replace it.
 
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