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Fuel pump replacement is a little bit expensive. Make sure you get a ECM code 22 for fuel pump failure. Also check the inexpensive things like fuel filter. If the problem is a mass air flow meter, the car will be in a safe fail mode i.e. the car will run but the rpm will not exceed 2000. I see in a nissan repair manual that the things to check in case your car stalls during start-up are: check timing, check throttle valve for rough movement, ignition wire and plugs, canister purge, pressure regulator, mixture ratio and exhaust gas sensor.
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