2008 Gmc Sierra High Speed Mis Engine Light Flashing Changed S Plugs Next

60,000 MILES
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ANONYMOUS
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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
Nov 18, 2012 at 1:37 PM
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DOCFIXIT
  • ✓Experienced Mechanic
  • 18,828 POSTS
Have codes read may provide a clue post codes will advise
Nov 18, 2012 at 1:45 PM
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