If the passlock is bad it will start and run for a couple of seconds then die and you can restart it and it will die again. This will happen every time that you turn the key off and try to start it. When you turn your key on can you hear the fuel pump run, it should run for a few seconds and shut off. Is the security light flashing on the instrument cluster when you turn the key on? You might just have to unplug the wiring harness at the base of the steering column and clean the contacts and make sure that it is tight.