When you head up into the mountains, it is a good idea to do the same as above, with the exception of disconnecting the battery.
If your bike is shut off and cooled down, start the motor and don't touch the throttle. Let it warm up to where the fans kick on, then off. Shut off the key, restart and you are good to go. Basically what you've done, is a forced recalibration of the ECM.