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?
have the same problem?
Monday, September 27th, 2010 AT 10:01 AM