hello i have a 1985 gmc 4x4 that has a crate motor in it.It ran fine and the starter went out so i put it in a demo car. I ran the car in one heat and the distributor cap broke so i was done. I put a new cap and rotor in it and it ran fine in the car so i put back in the truck. I drove the truck a few days with a little cutting out but now you drive it and it will die when u give it gas. It will idle fine but sounds like there is a air leak inside the carb.just wondering if anyone has had this problem. Thanks for the help.