08 Nytro dies when blipping the throttle

[Blackthorn9998]

I just bought a 08 nytro fx 40th edition with a mpi turbo kit. The sled is running great and has alot of the recommended updates done to it. I am having the issue though that when i go to pull it into or out of the garage or just around the yard, if i give it enough throttle to engage the belt and move slowly it dies everytime. It just stumbles and then shuts off. So when i move it around i have to rod the throttle and then hit the brake to avoid hitting stuff. Does anybody know what might cause this or how i can fix it because it is awkward as hell to move the sled around at all. Especially pulling it indoors.
Sidenote. The upgrades it has besides the turbo, is barkbuster front end and skid, fox floats, rov and tether, yamaha powder skis off like a 12 nytro, and tunnel reinforcements.