Sounds like a sticky float valve. You're burning all the fuel in the float going up through 1st 2nd and 3rd, then once the float bowl is empty and the valve is stuck mostly shut, there's not enough fuel to feed the motor unless you wait a few for the bowl to slowly fill back up. At least that's what it's been everytime I've had that problem. My suggestion is carb rebuild kit, but you may want to wait for some opinions from higher ranking blaster enthusiasts than myself. Good luck.