Engine Performance problem
1998 Chevy Silverado V8 Four Wheel Drive Automatic 157000 miles
intemittent rough running, Error code cylinder 1 misfire. Changed plugs wires rotor and cap. Still same problem. Put GM injector cleaner in and then yesterday it started doing it again and felt like it was running on 4 cylinders. Floored it for a while and it cleared up. Then excellerating onto the highway it happened again. Floored it for a while and again it cleared up.
Seems to happen under load like excellerating or towing.
Friday, July 17th, 2009 AT 2:29 PM