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Engine idle's too high, transmission doesn't shift right?
Any good websites for fixing this problem? Its on a 1989 GMC van v8 engine 350 hp 5.7 L.
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- gary oLv 71 decade agoFavorite Answer
could be IAC (idle air control) or simply the throttle body needs cleaning,they make a spray to clean this part. Just follow the direction on the can. As to transmission have you checked fluid level? Otherwise you need to have some tests run to see why.
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