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Check for a restricted exhaust. Could be the catilitic converter, a bent pipe or a collapsed baffle in the muffler. The engine needs to breath just like we do. It sounds like you are getting enough air in at idle and under load, but if that extra air can't get back out from being restricted, then it will bog down. It's like if you were to try jogging and only being able to breath out through a straw. That's what I would check before replacing a bunch of expensive sensors.
It could be the fuel pressure regulator, but that can be determined by testing the actual fuel pressure in the fuel feeder rail. But first, have you changed the fuel filter? The fuel filter usually is clogged with debris whenever a fuel pump fails, so be sure to change that first.
The Catalytic Converter is one possibility, but not likely. If when the truck bogs down, and stalls out, this could be more related to a fuel pump issue. If on your truck the fuel pump is located inside of the fuel tank, then once the pump heats up, this would happen. Acting as though it's something electrical, but it's really not.
most likely a weak fuel pump or a clogged filter. Check fuel pressure with a gauge or as its bogging down spray brake cleaner in the Throttle Body. If this allows it to increase RPM then its the pump or filter.