engine runs hot

1999 GMC SIERRA
265,000 MILES
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DERRICKG6687
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  • 1 POST
The truck has a 4.3 vortec in it When it rains and when its first started in the morning up until it reaches peak engine temp it misfires what could be the problem
Nov 22, 2011 at 8:09 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
http://www.2carpros.com/articles/engine-misfires-or-runs-rough. Defective spark plugs or vacuum leak.
Nov 22, 2011 at 8:13 PM
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