Re: Carb jetting ?/Colorado
Higher altitude requires leaner jetting to compensate for less Oxygen. The factory recommends 4* more timing, also. You could try the next leaner metering rods, they are easy to change on the AFB. If you are just visiting the area, I'd leave the jetting alone, but if you intend to move there, have the mixture checked at a good tune up/smog shop to see what change is needed, if any, in jetting.
Hope this helps, good luck!