so the other day i was driving down a feeder road about 45 mph when all of a sudden my truck started to take off like i stomped the gas peddle down to the floor. i panicked because a red light was approaching fast i hit the brakes but it only slowed it down a little bit so i put it in neutral to slow down and my rpms where pegged i then turned off the key but the truck wouldn't turn off either! after bellowing black smoke for what it seems forever but in reality was maybe 30 seconds until it shut itself down i coasted over to a side road and got towed home. after that i tried turning the key but it seemed hard to turn over like the batteries were weak. it now sits in my garage and I'm scarred i blown the motor and I'm puzzled what could of caused all this.