I have a plane that gave me trouble for the first 2 years. Kept fighting it, replaced all the fuel lines and it did not fix the problem. I was about to give up on the engine. I improved the problem by rotating the engine 90 degrees to lower the carb needle relative to the fuel tank. Everytime I got the plane inverted, the engine would flood out. The engine mounting rotation helped solve the flooding in inverted flight, but not the stalling. I finally tossed the (cheap) tank that came with the ARF and put a DuBro or Sullivan (I can't remember which) and the problem was fixed instantly. Now the engine never, ever stalls, unless I do the throttle cutoff from the radio.