2003 GMC Sierra miss fire up steep hill

Tiny
DOUG BENTLEY
  • MEMBER
  • 2003 GMC SIERRA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
I have a 03 gmc with a 4.3 x code engine. When going up a steep hill only, it miss fires and drops speed. When scanned it is showing miss fire code. Mostly on #6 cylinder. I have replaced cap, rotor, spark plugs, plug wires and crank sensor. That help some. I have recheck the cap, rotor and #6 spark plug. Every thing looks ok. Have you heard of this problem and any solution?
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Monday, September 27th, 2010 AT 10:01 AM

1 Reply

Tiny
RASMATAZ
  • MEMBER
P0306 -Check the compression and injector for no.6
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Monday, September 27th, 2010 AT 7:58 PM

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