3 years ago Bought our '94 GMC k1500 to tow our 28' TrailCruiser that only weighs 5,000 lbs loaded. Was a one owner, always garaged crème puff, however 350 sucked, still had original plugs, wires, cap & rotor at 126,000 miles. Would barely go 65 mph and wouldn't tow till I removed original air...