Hi Guys, My Max II has a 16 HP vanguard that wants to run rough and surge and almost stall unless I give nearly full throttle. It seems to happen after a rough bump. Sometimes it straightens up and sometimes not. I have a new gas tank with new fuel, new gas lines, new filter, have cleaned the carb and needle valves, when I put it back together it runs fine until I hit rough terrain and the Max gets jarred around. Does anyone have any ideas, Float sticking? fuel pump problem? I am stumped, and I would like to fix the problem myself, and not have to take to a dealer.