I have a chevy 305 with edelbrock carburetor 1405 an chevy 350 transmission. The problems I'm having is the car hesitates an spit gas out of top of carb when moving from stop position but car will drive an shift fine after that. Then after goin up an down the road a couple of times as the car heats up I can push the gas an it will barely move when first pushing the gas but soon picks up. What could be my problem. Thanks