sirius 12 esc setup

[notfastwes]

Hi, got a new sirius 12 esc and an lrp gt-4 21x2 motor. have gone through the set up procedures and have managed to get it working. Only thing is when i squeeze the trigger nowt happens for a good four-five seconds, then i can here the esc making that noise it makes and gradually the car starts to pull away and build up speed. Now if i let go of the trigger the car brakes immediately and if try to go again i have to wait all over again. On the other hand reverse is instant and a whole lot slower so i think i have all the wiresthe right way round.
Any help would be greatly appreciated.

Regards
Wes