This is a 92 gmc suburban 5.7L with 298,000 on it. Truck already needed intake gaskets so I replaced intake gaskets, tb gasket, egr gasket, egr solenoid, t stat, full tune up (plugs, wires, cap, rotor), fuel filter and air filter. Even after all of that when its cold out the truck runs very rough for the first few minutes until warm (almost like the egr is stuck open but its not). It also sometimes drops all power but stays running when cruising about 40mph and has no throttle response doesn't matter if cold or hot (not sure if these two problems are related, I'm betting they are just want it fixed)..

Cars & Trucks - Chevrolet - Suburban - 1992 Chevrolet Suburban