1989 Oldsmobile 88 engine running rough

1989 OLDSMOBILE 88
200,000 MILES • 3.8L • 6 CYL • FWD • AUTOMATIC
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DAN53
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when the outside air temp is 60 degrees or lower the engines runs good no problem. 65 degrees and up car starts running rough after a few minutes runs rough all speeds . check engine light does not come on . shut car off for 10 minutes start runs good for awhile than starts running rough again . the warmer the outside temp is the quicker it starts running rough . stumped dan please help thank you
May 12, 2014 at 10:22 AM
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JACOBANDNICKOLAS
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Has the temp sensor ever been replaced? When it starts running bad, have you ever noticed any black smoke from the exhaust or a rich smell from the exhaust?
May 12, 2014 at 10:41 AM
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DAN53
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temp sensor has never been changed . no i haven't noticed anything with the exhaust .
May 12, 2014 at 10:46 AM
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JACOBANDNICKOLAS
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I need you to scan the computer, even though the check engine light isn't on. Do you know how?
May 12, 2014 at 5:51 PM
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DAN53
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scan the codes by the ignition switch , counting service engine light when it flashes the codes
May 13, 2014 at 5:01 AM
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JACOBANDNICKOLAS
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There should be a port that where you jump the A and B terminals to get the codes.
May 13, 2014 at 8:52 AM