Spent the night on La Salle Pass (10,000') and the next morning, coming down, my F800GS wouldn't idle. It'd stall. I had to bring rpm up to around 2000 to keep it from stalling but that made the decent really treacherous. Back down to 4000' (and home in Houston at 100') it is a little rough until it warms up but it runs. Any guesses where I should look to fix? Appreciate your help!