When starting my car, it starts briefly for 2 seconds then dies. I don't believe there is a problem with the battery because it seems to crank over fine and doesn't get any weaker. Every time I try. I've been told that I have immobiliser problems. I can start the car eventualy by leaving the key alone in the ignition for 10 minutes and allowing the immobiliser to reset itself but I have to rev the car up a lot for it to keep running. After it has started, it runs fine. I only have one key so I don't know if it is a problem with that. Any suggestions on how to get it sorted for good?