Need help with a 1999 GMC Yukon 4x4! It has a 5.7L 350. It is stalling when I take off. I have replaced the alternator and battery because it has died while driving a few times. I have also replaced the fuel filter. I am thinking of replacing the rotor and maybe distributor cap because the tips look old and somewhat corroded. I have been told it is a computer but am unsure.