Engine Mechanical problem
1998 GMC Sierra V8 Four Wheel Drive Automatic 140000 miles
My 98' Sierra has just started misfiring. The code I got siad it was misfiring on multiple cylinders and I got the code twice in one reading. I've already changed the fuel pump, fuel filter, pick-up coil, rotor button, plugs and wires, and cut both cats aloose. It seems to get worse when I put it under a load, it does not backfire. Do I need to replace the ignition control module? And where is it? Any advice would help cause im at a stand still now, don't know what else to do. Please Help!
have the same problem?
Sunday, March 1st, 2009 AT 7:03 PM