My son has a 2008 or 9 Tundra with the 5.7 liter engine. Yesterday he had a problem with his truck. While he was driving his truck the engine died. At first it would not re-start. After sitting a while it re-started. He was able to drive a very short distance then it died again. He had it towed home. Seems as though it will run a few minutes then die again. What do you think the problem is?