I just got a 77 280z and its in great shape other than the fact that it doesn't run. It has many many new parts and only 112k miles. it will crank and stay on for a minute or two and then just sputter out and slowly die, as if its running out of gas. fuel injectors look new, I put a new fuel pump in and still the same problem. the last owner said it might be the fuel injector relay...replaced and still the same thing. would it be something as small as a inline fuel filter or something bigger? any suggestions would help alot. Thanks