Crazy Fsx Situation

Hey guys,
well heres a report for ya coupled with request for suggestions. as you all know I just took the plunge and am trying the FSX well graphics are unfriggin believable, however I tried a default a320 and speed was np as soon as it got airborne I hit autopliot FD was on ATHR on and gear up the aircraft pitched straight up nothing i could do to stop it. I turned off AP and FCU and manually got it under control. Switched A/C To CLS FSX 340 500 and issue dissapeared however takeoff was very slow and almost not even V1 hmmmm

Well its bedtime I have services to conduct in AM so need some sleep, Night all God bless

Tim
A340