Up hill travel lose of power

Could be that your cat is clogged up,the way to check is to remove and look in both ends,mine clogged up and caused my head gasket to blow between cylinder 3 and 4 on my 85 Nissan 720,part of the inside came apart and was blocking the air flow,causing my exhaust plugs to blister.

Check for trouble codes.

could be a wiring issue to the tp sensor its self or a problem withe the throttle body or pcm

It should have a code stored. Some places still carry the scanners for OBD 1 Fords for around fifty bucks. Without knowing anything else about the truck or what codes you have, it sounds like you have a bad throttle position sensor.

The oil pump may have gone bad. Involves dropping the oil pan and replacing the oil pump, check the pan for any metal peices.

Is there somthing hitting the gas pedal, like the floor mat? Or maybe something under the dash came loose and is getting caught under the brake pedal and pushing on the gas. Put the shifter in neutral if you get into a situation where going to hit something or someone. The engine has a rev limiter, to prevent it from over reving.

When was last time plugs & wires checked or replaced, as well as fuel filter.

Depending on how much gas was in the tank and how steep the hill was, the fuel pump most likely started pumping air instead of gas, thereby stalling the engine.

COOLANT temp sensor

is bad not allowing engine to run enriched fuel

engine heats up enriched fuel is not needed

proof can be found in fault memory

it may be fuel pump ? how much fuel is in the tank ? these trucks are famous for their fuel pumps overheating when the fuel level gets below half or sometimes evem a quarter tank. if the fuel tank is full you may want consider replaceing the fuel filter (as a good routine maitenance procedure)and see what happens then.