[fasteract7]

Smells to me also like a fuel starvation problem also. Has the fuel filter been changed in the last 10 years ? Can you run her on flat ground/Interstate at 80 mph without any symptoms, running her up to near redline in 2-4 gears ?

Have you checked the undercarriage where the hard lines run to make sure the feed/return lines to the saddle tank haven't been pinched by hitting a foreign body or a nice chunk of ice hardened by your single digit nights up there !

Then there's a failing fuel pump but don't this so....you would think driving in 1st gear on flat ground would mimic any steep hill conditions you would encounter.

Good luck...