Was riding my 1999 GW GL1500 SE and all of a sudden, while gearing up after a stop, got absolutely no tension from throttle-handlegrip just spun around. Had to call for flatbed and brought it home. Since it's weekend and holiday to boot, will have flatbed deliver to shop on Tuesday - has anyone ever had this happen? Could it be the throttle cable??? Just want to get an idea of what it could be as it has never been to this shop before. Help!