To all, I replaced the fuel filter today and it made a huge difference. I'm not certain that I've resolved all of the problem associated with lack of power under load, but it went a long way toward bringing the ground speed back up to about what i believe should be normal. Thanks to all. P.S. It solved one problem, but raised another, which I might start in a new thread if i can't figure it out. Thanks, again. This forum feedback has been quite helpful.