cars running like crap

u are seeing the gas vaporize out of the carb.

Sounds like u are running rich. If u have a holley adjust the idle mixture screws. I have mine about 3/4 of a turn out . All cars are differant so u have to experiment.

The hesitation u are talking about sounds like the mixture screws (if a holley) are set lean. When u go from idle to throttle u have a split sec or so where gas doesnt enter carb. So hard for me to explain.

Hope this helps.