i bought another 2008 Chevy yesterday with the 6.6 in it. it was a 3 hour drive home, topped it off with fuel and headed home. About 2.5 hours into the drive we stopped to to get a bite to eat the truck was running like a champ. About 20 minutes late it started rite up, ran about 10 seconds and shut down. Any idea what went wrong. had it towed home.