2oo1 1500 5.2- 217000 mi When trying to start it truck has trouble turning over, draws volt down to 8v, resets ecm, and will crank lil faster and start, sometimes though soon as it starts it will die, then fires up and runs fine. When cranking its almost like it would have water on cylinder. Removed all plugs, they were clean. Crank truck over no coolant shot out of cylinders. Battery 6 months old. Any ideas what it is or what i can check?