My Brison 3.2 just started to do this. If I go from low idle (1950 rpm) to WOT quickly, it'll sputter and quit. If I advance the throttle slower it runs fine. Been everywhere on adjusting the needles. I've gone real rich on low, then leaning the high. I've gone rich on the low and left the high rich, but then it burbles bad. Then when I lean the top back out to get it not to burble, it quits under fast transition. No good. I seem to end up in the same place every time. Checked the screen, it's clean. Fuel system is clean. Timing's right on. Sometimes even when the engine is hot, it still needs to be choked to get it started. It also doesn't seem to draw fuel well on cold start-up. I always have to prime with a shot to the carb. Thanks for any help.