I have a 92 lumina that has engine light on and is running rough
Cooling fan running for no reason. Then engine light will turn
off for no apparent reason. Fan shuts off and it runs perfect.
This might happen a minute later or a 100 miles later. Any
Chances are that it generated an alarm that's still on the OBC even if it's not shown on your display. Have someone put their OBD (on-board diagnostic) into the plug under the dash ... it should tell you what caused your problem
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