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High Idle

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Hello I have a problem that started a few days ago. When I start it in the morning it revs really high. I mean a lot higher than the normal rev up. And it won't rev down unless I turn it off two or three times then it settles down. It has also done this in the afternoon when I get ready to go home. I researched this and came up with IAC. What do you think? Also is there a way to test the IAC before I replace it. I tried finding the test in the FSM with no luck. Oh it is an 88 4.0 4x4 ba10.


Thank You


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