[Jetex]

I'm really going to take a wild dip at this one. I think there is a problem with your shifter/ignition cylinder interlock. I am not clued up on your specific model car but there is normally a cable that is driven by a solenoid that interlocks your shifter with the ignition cylinder. This is there so that you can only remove the key in the park position. By removing the fuse you defeat the interlock and can then remove the key. Either the solenoid or cable is defective or not adjusted correctly.