01 GMC Sierra 4.3 started missing while driving. I checked the plugs, wires and ignition. I noticed white smoke and water coming out the exhaust, I have had to add coolant a couple of times in the past few months. I don't see any external leaks. Could this be a head gasket. I have got a P0300 & P0302 codes.
Last edited by darrydekens; 10-26-2015 at 04:24 PM.