I appreciate very much all your answers; sadly enough I followed every advice (even changed fuel tank/lines). No improvement. Engine still looses power on transition to full throttle. If transition is slow it may recover, but still looses power at some point like middle way bettween iddle and full. If stick movement is done fast, it dies. I tried everything, from engine instructions to advices in this forrum, still to no avail. Unless I've been unable to set it correctly, but since I tried many settings and the problem is always the same, I was wondering if someone has found this behavior in an ASP engine and has another solution, or if maybe the engine is simply a bad one. Thanks!