Fuel to truck cutting out while accelerating?

just bought an old f150. test drive went good, what we didnt notice until after we bought it was that after it heats up something with the fuel starts to cut out. the more you accelerate the more it cuts out like its starving for gas. the lady replaced the fuel pump last october (im assuming she thought that was the problem, and couldnt figure it out after that so thats why she sold it) and she also replaced the fuel filter at the same time. i put on a new fuel filter anyways yesterday and noticed the old one was on backward. new plugs and wires, new coil. i heard from a mechanic now it could be either the ignition control module in the distributor or the fuel pump relay and eec relay old and corroded. before i spend any more money on this 800$ truck i would like some more ideas please? i do believe that it is something electrical because it is most apparent when the vehicle heats up. thanks