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Don't try to adjust the idle as it's controlled by the computer. I doubt the IAC could cause all of your problems but it could contribute to them. To check it.....More stolen from Binder planet FAQ.

 After this check if there is air being sucked in through the hole directly above the IAC and under the air cleaner. The IAC should be closed so there should be no air. After this turn off the engine and plug the IAC back in and start the engine. Now there should be air sucked into the hole...

That's about as good as you can test it without more test equipment as far as I know..


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