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If the fuel in the tank is old, or he used a mix of junk and hasn't run the truck in a while, the goo is just old fuel. Dump the tank, insert new fuel and try it out.

The IP is probably okay because you are getting fuel. The engine just bogs down when you rev it up, because it is starved for fuel supply. However, the old fuel isn't helping things. Drain the tank, replace with new fuel, and filters, and I'd bet it will run like a stuck pig.

I'd guess filters. However, one of my deuces I bought had a crimped front fuel line, the one that goes from the primary filter under the radiator to the left side of the engine to the secondaries. The copper line had a big crunch in it, maybe from a forklift, who knows. I just cut it out and...