The transmission has been replaced, the fuel system has been cleaned, and all fluids are replaced recently. The truck died in my driveway, and I have spent a bunch of money working on the blasted thing! Why did it die, is it because of the cold? Any assistance would be appreciated. When the engine is revved it sounds violently rough, even the tailpipe is shaking. The car was doing better after the transmission replacement, but suddenly it is doing really bad.