109 Immelmann, looping

[erzwodezwo]

Hi,
first of all sorry for my english, no native speaker...
second im not an experienced pilot, just started to get in this sim.

im flying the 109 exclusivly because its the only plane i manage to start and fly with full realism. the problem is when im in a dogfight and want to perform an immelmann turn or a simple looping the plane stalls immediately and it gets out of control. im pretty sure the good old 109 can do a looping/immelmann, just not with me on the controls. i tried it with different airspeed 200-450km/h. the result is always the same-stall. is this some kind of bug or am i the one?

thanks