what kind of gas are u putting in your truck, if your going to the cheapest gas station on the block this could be the problem. thats what happened to me me. my truck would star briefly and shut off. really bad carbon deposits with cheap gas.Well for me, the motor just doesn't want to turn over when it's warm. Seems like the starter is cranking normally though. I've got about 4 years or so on my battery, so I guess it's about time to get a new one anyway.