ENGINE RUNS HOT

  • Tiny
  • DerrickG6687
  • 1999 GMC Sierra
  • 265,000 miles

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

Tuesday, November 22nd, 2011 AT 8:09 PM

1 Answer

  • Tiny
  • rasmataz
  • Member

http://www.2carpros.com/articles/engine-misfires-or-runs-rough. Defective spark plugs or vacuum leak.

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Tuesday, November 22nd, 2011 AT 8:13 PM

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