It could be the carb needs to be rebuilt. I have a 1971 f100 myself is a 360 manual 4 speed and that fixed that problem. The accelerator pump on it wasn't working causing it to be way down on power and bog down when I was giving it the gas. If yours is an auto tranny then there could be something wrong with it like its skipping first gear or your torque converter isn't stalling when it should. Hope this helps you tjman oug
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bad synchronizer
This is a safety feature.
Because it gets hot, then the sweat glands send out the sweat, which causes it to cool down.
Oxygen sensor
could be u-joints or a sloppy ring and pinion gear mating. The slack has got to be taken up somewhere. Without knowing the mils i would get under truck and wiggle up and down and side ways and twist by hand all the u-joints and look for wear even rust, that would be the cheapest fix