C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1989 idle problem

Old Aug 15, 2014 | 03:16 PM
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james henry
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Default 1989 idle problem

My autimatic 1989 has a idle problems, where it idles high (15-18 Rpms) in park but once put into gear it drops dramatically until the point of stalling. Any ideas on what it could be?
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Old Aug 15, 2014 | 06:08 PM
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My first guess would be an IAC problem, possibly combined with a vacuum leak.
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Old Aug 15, 2014 | 06:42 PM
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check timing/ tps/ set min idle....first..check for a vac leak....
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Old Aug 15, 2014 | 09:06 PM
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with the guys above... Pull the IAC and clean it with spray cleaner..Pull the bottom plate off the Throttle body and clean all the channels under there with an old tooth brush and cleaner...Then set your minimun idle like suggested if it's still off...Don't forget to check for a vacuum leak.......WW
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