Engine Performance problem
1997 Chevy Silverado V8 Four Wheel Drive Automatic 350000 miles
I have a Silverado C1500 with a 5.7L 350 Vortec engine. The engine will idle fine, but rough and will run so rough going down the road that it will literally shake the entire truck. Power has dropped and passing someone on the highway is nearly impossible.
I've changed plugs, wires, distributer cap, rotor, coil and fuel filter. I've even pulled both upstream O2 sensors to see if I possibly had a plugged Converter or Muffler, but this did not seem to help.
I know this truck has a lot of miles, but has always run well, and I've run out of ideas. The OBD scan shows " Manufacturer Ignition Control or Misfire" or something similar.
Tuesday, June 24th, 2008 AT 10:32 AM