rotax 912 uls age2002

I have a serious problem with my Rotax 912 ULS. It starts fine but runs rough, and at 3800 rpm it stalls. The entire fuel line has been replaced, along with a new mechanical and electric fuel pump. The fuel pressure is correct, the spark plugs are new, the carburetors have been checked and everything replaced, including the floats, and the air filter is new. The air intake and exhaust have been checked and everything is fine, but the engine stalls when I accelerate to 3800 rpm. Importantly, the intake pressure is 27 bar at 3800 rpm. I can only think of the Ducati modules, but the ignition test is correct; the rpm drops by 150 during the tests.