Engine Performance problem
2001 Chevy Silverado V8 Two Wheel Drive Automatic 94000 miles
This problem only happens at speeds past 65mph. Got the Code p300 Random misfire. Replaced plugs and wires no help. Then replaced fuel filter no help. Then had the injectors cleaned no help. Replaced all 4 o2 sensors no help. Scoped eng. Found #1 #5 #6 and #8 cyls. Misfiring swapped #1 coil pack with #3 to see if misfiring would follow it stayed on #1 all Vacuum lines look good. No other codes show up.
Wednesday, October 7th, 2009 AT 7:38 PM