well to me that sounds like you need to clean your carb, possibly turn the gas cap to the on position and if you did maybe clean it out so that it can properly vent the gas tank, but i believe the problem is fuel delivery you are not gettin enough fuel because when you give it throttle the excess air kills the engine. so if it was me i would clean the carb and make sure that enough gas is even running to the carb maybe the gas line is clogged. or maybe the fuel filter is too dirty. but pretty much just clean out all the fuel system. now i have a question do you know how to reconnect the wires to the brake switch i cant get them to stay locked in the switch and i dont know how to work on that.