My dad has a 1976 dodge truck 360 automatic 2wd. Recently it started missing badly after the truck is warmed up. Occassionally it wont even start from a cold start but usually does and runs fine until warmed up. He has replaced all electronics (coil, ballast resistor, voltage regulator, electronic ignition, plugs, plug wires, etc) except for the wiring itself. Fuel pump, fuel filter and we swapped on a different carberator as well and the problem still exists. Any ideas as to what could be causing this problem? Thanks.