35 mph WOT power loss

DentalDart said

Just double checked the kd and adjusted it a little. It is 100% slack free at WOT now... now I just have to drive it and see what happens. I also want to check out my acc pump in the carb, make sure it is working as it should.

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"Slack free" don't mean dick. When the gas pedal is on the floor, is the kickdown lever on the transmission as far back as it can possibly go? Have you crawled under and checked it with someone holding their foot on the pedal on the floor?