Well, I replaced the IAC valve and sprayed the butterfly from outside the throttle body and scrubbed it with a tooth brush. It wasn't quite as dirty as I thought it would be, but it did have some gunk. Funny thing is that is also what the mechanic suggested (I never told him I was gonna do that). Now the truck isn't dying but it is trying to idle too high and fluctuating until it finds the right idle. I still wonder if the elbow behind the throttle body needs replaced. Also, I need to figure out how to reset the service engine light. Pull off battery cable?
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