I have a 1971 datsun1600 pickup that will idle fine but once I start driving it will die. I can only make it a couple hundred yards. Acts like its not getting fuel but it is. There are no vacuum leaks and I've replaced a lot of components. New radiator,thermostat, water pump, cap/rotor, wires/plugs, oil and coolant. Something is causing it to die after it heats up. Once it cools off it will start back up. Any help would be appreciated. If I get an answer that solves my problem I will donate 10.