[Fr. Frank]

I agree with Denny. Sounds like some dirt clogging jet or jets for the idle problem. As for the fuel running out of the front of the carb, same thing. The float-valve needs only a tiny spec of something to hold it open, and allow excess fuel to fill the carb and then run out the intake side. Unfortunately, to stop this, iff you haven't done it recently, you probably should pull and clean the carbs, replace all the fuel lines on the motor, and clean/rebuild the fuel pump. A real common problem is minute pieces of fuel lines coming loose from the action of the ethanol degrading the fuel line integrity, and becoming lodged in various locations where they imitate little monsters called gremlins.
I HIGHLY recommend the new marine version of STABIL made for use with ethanol fuels.