Engine Performance problem
2000 GMC Sierra V8 Two Wheel Drive Automatic 135000 miles
OK, changed wires, plugs. Still get a PO303 code. Engine is unsteady at idle. Runs fine for a second then boom a miss. Does this about every 2 seconds. Steady smooth idle then is missess a couple of times then good again. Should I go swap coils to check those?
have the same problem?
Saturday, August 8th, 2009 AT 10:37 AM