Had it happen on a 6v53 in a M113A3 once, I hate working on those!
A little related anecdote, when I was in Iraq in 05-06, We were out at an outpost with a Iraqi battalion. We had a Iraqi SF team roll in in M113A3's, with I assume Blackwater guys driving them. Me being the Motor Sergeant, they called for me when they parked and I headed on down there. One of the drivers was telling me "I've been driving these for years, and I have a run away engine!" I hopped in, pushed in the hand throttle, and pulled the engine shutoff (one is right above the other).
