Mine did something like that until around 4 gallons. I had problems getting a good idle even with tweeking the low end until the 4th gallon. I had that problem at first with the sudden stop and it would die thing. All I know is it seemed to go away. Too bad the plane crashed last friday!~(. The engine was fine it seems and I ran it for 10 minutes here at home and was really good. Seems weird that DA would not want to have the engine sent in for a checkup. ???

Joe