I'm not real good with motors so figured I'd see if someone could help me. My motor will start and everything fine, but whenever I start to push down on the throttle to idle it's okay, then I'll start to open it up and when I push down on the throttle it dies. I usually can go back and push on the gas line bulb and it will be fine. When i shut it off and repeat the same steps it dies again and i have to go back and pump that bulb a few times. Any suggestions on why it keeps dieing about half throttle.