roc 86

hey guys a have a 89 iroc that i just put a lt1 in it's all hooked up and i sent my computer out and had it reprogramed removing the vatts system from it and i just put it in and the car starts run's for 2 sec then shuts off if the computer was redone then do i need to do anything with the vatts that was in my car before when the car key is turned forward the pump comes on and it has spark so im lost thanks bill