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Ses light flashing, truck running rough - 1997 GMC Sierra

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Good Evening. I'm sorry to hear your truck is running bad, however I can give you a few points to check on. Your flashing SES light is because you have a misfire in your engine. The misfire could be caused from things like spark plugs and wires or a cap and rotor, low fuel pressure or bad gas. Or the other things like an intake leak or a bad valve so diagnosing is harder without the code that is set while your SES light is on. So get a scanner hooked up and see which cylinder it says is misfiring and go fron there back to the wire to the cap etc. Hope this helps and if you have any more questions please feel free to ask.

Posted on Aug 26, 2010

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