Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
and consult a qualified repair shop when needed.
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CARADIODOC
CAR REPAIR CONTRIBUTOR
34,308 POSTS
What have you checked? Any clues or observations? You know we need more to go on than "just started running rough". Could be a problem with spark, fuel pressure or volume, EGR, compression, valves, fuel quality, or the common GM generator problem.