Does it do it in all gears? It MIGHT be the clutch disc is sticking to the flywheel? If it is sticking, it'll bog the motor and cause it to die.:scratchchin
I would ask either rlg34750, EagleAutoSports or Racin 366. they are the motor, go to guys here that I would trust for this. :bigthumbsup
Richard
Tech Support
Tremec TKO, T45 & T56 Transmission Systems