re:1990 Buick Dashboard Display/Service Engine Question

sounds like a fuel problem. Try some fuel injector cleaner. CD2 is a good one. If an injector is clogged, it will cause misfires. That is why the SES light would come on then go off. The code is stored in your computer- scan for codes. It will most likely show a cylinder misfire.

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gandalfthe_grey
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