I was driving down the road and heard a loud bang, I thought I blew a tire. The truck stop running and did not want to restart. I got it to start but it ran really rough and id not want to idle. I got the trailer diconnected and the pulled the truck away from the trailer. The turbo still spins freely but is missing just a small corner of the leading edge of each blade. What happen the motor only has 120,000 miles.