My 300zx turbo five speed has this problem that it is anoying me to ****. The car starts up fine with out any problems. Exactly a minute later the car just shuts off. Just as if someone has turn the key off. The computer said that the throttle positon sensor was bad and the Mass Airflow Sensor was bad I replaced them both and I also replaced the fuel pump. These did not fix the problem. Right before it turns off I here something like a relay that clicks then it turns itself off. Has anyone had a problem like this because I am just stumped and don't know what to do.