exauhst manifolds glowing red.but i have no cat
Sounds like high speed, lean operation.
what is going on with your mixture...timing? late...oh so late ignition...change the fuel on us?
Roy wtf are you talking about? The only fuel that might cause this is alcohol and it's doubtful he is running that. The timing will make the truck run like crap before it cherries the exhaust and he would be here with that issue instead of the one he has. Tenspeed is spot on.
IAC MOTOR /VALVE DEFECTIVE
Exhaust valve leak or running lean, guaranteed
Looking for a Used Suburban in your area?
CarGurus has 157 nationwide Suburban listings starting at $1,974.
Search GMC Suburban Questions
GMC Suburban Experts