Revs in park

1991 BUICK PARK AVENUE
140,000 MILES • AUTOMATIC
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TLTOUMBS246
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My car is running rough and three service engine light is off and on. They connected the code reader, but my car was not putting out power to the reader. When I put the car in park, it revs then almost shuts off, revs, almost shuts off. Sometimes it just quits running. Any help is appreciated.
Aug 21, 2018 at 12:45 PM
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STRAILER
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In 1991 the car is OBD1 so you will need to follow this guide to get the codes.

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

This guide can help as well.

https://www.2carpros.com/articles/engine-idles-too-high

Please run down these guides and report back.

Cheers, Ken
Aug 23, 2018 at 10:16 AM
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TLTOUMBS246
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Thanks Ken. One code was the lean exhaust. The second link you sent has a ton of useful information! I will let you know what we figure out. Thanks again!
Aug 24, 2018 at 4:09 PM
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STRAILER
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Please let us know what you find. We are interested to see what it is.

Cheers, Ken
Aug 25, 2018 at 11:43 AM
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TLTOUMBS246
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It was the air control valve. It took the mechanic a few days to figure it out though. Thanks Ken!
Aug 29, 2018 at 2:32 PM
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STRAILER
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Yes, that is where we were headed. ;) Use 2CarPros anytime, we are here to help. Please tell a friend.

Cheers, Ken
Aug 30, 2018 at 9:47 AM