Hello, I have a John Deere 717A with a 19hp Kaw engine and I am having some minor problems with it. Once in a great while I will be mowing along or sitting at idle and the engine will die. This happened just the other day and I tried to restart it and all it did was puff out white smoke. The first thing I thought about was gas in the oil. Anybody have any of these problems with the Kaws? How do you fix it?