your problem could be caused by a host of diff things.emmison/maint light is to warn you of impending problem,it can set code but not always,it may take the place of check engine light.you should be able to read the codes with grounding one of the pins in the diagnostic plugin[on GM vehicles up to 95 anyway]and key on.
I would go to www.alldata.com a online site that covers just about any vehicle on trouble shooting and repair,most if not all shops use it. about 25 pop a year per vehicle.
I used it to solve a similair problem on a 93 grand am,in my case it was a bad injector coil,but it could be as easy as a bad ground connection.
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