i need some help i have a nytro with mpi stage 2 with the fuel system and i cant keepthe thing runing up top around 7500 feet and when its down below it runs ok and i set it up how they tell me from mpi and it wont run at all !!! no mid range throtle it workes past there not bad but you cant let off or it stalls and craps out when you get on the throtle???