Just bought a 1000 Fazer

[Roky]

Hello
I have one question. I just bought Fazer 1000, year 2003 and I have some problems. It starts ok, and it runs on idle with no problem when the engine is warm (if it is cold I have tu use choke).
But the real problem coms when I rew the bike. If I twist the throttle right away, in idle or artound 2000rpm, the engine looses the power, and if I wouldnt release the throttle the engine would shut down  :'(
But if I accelerate slow, everything is ok. And also above 5000rpm everything works ok.

Does anyone have a solution to this problem?
I didnt have thet kind of problems on my old fazer 600 also year 2003.

Regards,
Rok