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Old 04-05-2011, 08:23 PM   #22
ChevyTech
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Join Date: May 2004
Location: Minnesota
Posts: 4,620
Re: 89 tbi running & starting problem

IAC passages can get plugged up with carbon or muck. Did you clean them?


The IAC (idle air control) is what gives the fast idle speed when started cold.


The engine should start well without the gas pedal being pushed down at all.


My guess is the truck runs so poorly you can not tell if the IAC is working or not.
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