Just bought a 08 F350 6.4L, and was driving down the road going about 50mph and went to speed up to get over and the truck acted like it went into neutral the rpm's went up but not the speed. Pulled over and the truck acted like it was going to die for a second but then the rpm's started to rise while the truck was stopped but still in drive. Shut the truck off and let it sit for about a minute then tried to start it was the motor would not turn over. Everything else sounded like it was working but nothing happening with the motor. There are no codes that showed up at all. Anyone else had this problem? Or have any ideas what it might be?