Was out on Sunday and noticed what seemed like a misfire at low rpm. Seemed to be less at wot. Opened up the cowling after about an hour of running and smelled gasoline. On the top carb there was a line going nowhere. I’ve never noticed this before. Just an FYI, new E3 plugs less than 50 hours ago, use non-ethanol gas always and go out almost every weekend. The miss was gone after the second part of being out. Anyone know if the line is a breather or vent and if not, where should it go? Why would the miss just quit and start running good again? Thanks