You probably need to set your idling up or if you are running a performance cam, you need a stall converter. What it sounds like is you have too much load still on the transmission before the converter can start free-wheeling. Other than that, it sounds as if your carb is over-loading and flooding out and if that was the case, it would be hard to restart. Try setting your idle up a tad first.

Truck Tinker from Talking Rock, Ga.