While driving this vehicle, it had repeatedly stalled out for no apparent reason. We had it inspected and found no cause for the stall out. We would have to put it in neutral and restart the vehicle. Then while driving down the freeway, it's stalled out again and the engine begin knocking. We were unable to get it restarted. Upon taking it to a shop and having it inspected, it was determined that the engine was blown and needed to be replaced. It was damaged on the bottom end of the engine. The cause of this damage is still unknown.