I have a 1993 Nissan Altima GXE with 112,000 original miles on it. This car starts up perfectly and runs like nissan's do, purs like a kitten, but then, after about 15 minutes of running, it starts to back-up and act like it's flooding out or something, shaking and spitting and spuddering, and then wont run. Let it sit awhile, or the next day. Starts right up, runs great for 10-15 minutes, then dies out spitting and spuddering again. Is it possible this could be my fuel pump, or do fuel pumps just flat go out?The car has brand new Plugs, Plug Wires, Cap & Rotor, Air Cleaner, & Fuel Filter. Other than that, the car sounds sweet. This is driving me crazy and I really need this car.