95 Nissan Altima will start, but quick throttle up will stall engine.

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After getting gas, my daughters 95 Altima lost power and died. I replace fuel filter and after many attempts got it started. Idled fine, but when I tried to drive it, it would die like it ran out of gas. Would restart with some difficulty and could drive as long as I didn't try to accelerate too quickly. Got it home and checked codes. 325 and 1400. Replaced the EGR switch and checked the valve. Pulled the fuel line from filter and It spits fuel pretty good. Replaced the O2 sensor upstream. Started a little easier. Good spark to all the plugs. Tried to find the crank shaft position sensor last night and gave up. Kind of suspecting fuel pump, but wanted to be more sure before investing the $150.