I was reading someone else's topic about bogging and I just remember how my sled was acting before I put it away. It was really weird, running at just about any speed it would just suddenly die down to almost killed then pick up and go for a while again. Every time I tryed to show some one it wouldn't do it. Should it be something to worry about? Thinking about it now, might be something in the gas? I don't know. Anyone ever heard of this? My sled is 98' Formula Z 670.