Hard to say. How are the plug wires? Does it misfire or completely cut out? Could try changing the fuel filter, coudl be clogged. If the pump is out of a VR4, is it stock or aftermarket? Could be a bad injector or just a clogged injector.
You are going to use a lot more fuel under load vs free reving at idle. If its not an issue with the plugs/wires, it has to be a fuel problem. You could try running injector cleaner through the gas tank(some people think it works, some people think it causes other issues). If your going to run the injector cleaner, do it before you replace the fuel filter as the injector cleaner will bring up the crud at the bottum of the tank.
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