Next time it does that choke it out! It dieseled on you. This is a condition that happens when there is an air leak in the base gaskets. What is happening is fire should be happening on top of the cylinder and since you have a leak it is happening on top and in the crankcase therefore you get what you got! First tourque the jugs down to the proper specs and see if that stops it. If not replace your base gaskets. It won't do it in the water due to back pressure on the engine. But don't screw with it until you fix it.:appl: