[EricFromPa]

Do you think you're losing spark or gas ?
My first thought was the maybe the float in the carb bouncing around...just a wild thought.

Yep that will do it. If the float is set to shutoff a bit early the fuel will slosh away from the jet when you hit a bump. I've had that problem with alot of carbs that have a side mounted or angled jet that sits up off of the bottom of the bowl a bit. Walbro Kohler carbs do the same thing if you make the float level with the carb body because they have an angled side mounted main jet in them.