Should die if you kill the air too it also. Just plug the carb with something. Just make sure it ain't a rag and you don't let it get sucked in. I'd be a little nervous about using the palm of my hand too. Maybe some cardboard or something. Had an old Zilla that would do that just sittin there idling with the fuel and everything on. Slide was worn out in the stock carb sucking too much air. First time it happened out in the middle of nowhere right after it threw the chain. Scary mofo. Slapped a new pwk on it and it ran like a top.