Tobey,
Most carbureted engines need a little extra gas when the throttle opens and there is a load. That’s why car carbs all have accelerator pumps. This is aggravated by a lean mixture at idle. Lean mixtures are due to all kinds of things: dirty air filter, dirty fuel filter, carb out of adjustment, air getting sucked in because the carb is loose on it’s mounting or the gaskets are old, hard, torn, etc. If you are lucky, a half turn or so counterclockwise on the carb adjustment screw might do it. Make sure it’s not the idle adjustment screw, which will lower the idle. Actually turning up the idle a bit will also help.