After reading all of the communications on 413 fuel pumps, it just dawned on me that this could be my the answer to my acceleration problem also! When I stick my foot in it, my H acts like it should up to about 50 mph and then sort of " blubbers", or partially dies.When I accelerate like a sane person I don't have the problem. I first thought that it was a carburetor problem, but I got the same results with a second set of carb's.I then started to question my distributor and am trying to find a sun machine to get it checked. Am I correct in thinking that my problem could just be being starved for fuel? While I'm on a roll, I may as well ask about fuel additives. Should I be adding anything to this 91 octane stuff that we get out here on the left coast? Any and all help will be greatly appreciated. Doug Warrener 300H HT.