Ok ive done the RCM and it still hasnt solved the problem so its obviously something else.

I reconnected the battery and turned it over. It fire up and after 3 secs died.
I started it again and it lasted about 2 secs.
Started once more then start and die.
Now wont start

If i disconnect and reconnect it starts the process again.

All the electrics come on and the spoiller pops up

So confused??!@@