91 is throttle body injection. CArefully spray around the TBI unit with carb cleaner for vacuum leaks, spray all lines if the idle changes you have found a leak. Coulsd also be the Idle Speed Control Motor, this is a big round motor on the P/S of the TBI unit with a square 4 wire connector, might be stuck
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Wednesday, February 13th, 2008 AT 11:27 AM