Carter competition series carb problem

I have a bad stumble a little off idle. The car starts move, then the stumble, then keep pushing the trottle and it goes past the stumble and really takes off.
I dont need to accelerate hard from a stop to make it happen. It happens even if i'm accelerating slowly.


i believe the carb is a 750 cfm, the pump adjustment is set in the hole farthest away from the carb i believe it is a pump shot issue. any ideas?