Mechanics

GMC SIERRA ENGINE PROBLEM

2008 GMC Sierra • 60,000 miles

High speed mis, engine light flashing, changed s plugs. What next?
also smells like cat converter overheating when I shut off, no red glow, but a high speed mis, usually on the highway
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Guest
November 18, 2012.




Have codes read may provide a clue post codes will advise

Docfixit
Nov 18, 2012.


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