ford focus 2.0tdci intermittant starting

[courty]

hi got a 2005 focus 2.0tdci with starting problem??sometimes not always when i come to start the car it is like it has gone into limp mode will start but no revs. if i turn engine off lock the car and deadlock car then unlock car and start the car starts and revs up???
there are no fault codes coming up and no engine fault light on dash.seems like something to do with central locking/immobilizer?any ideas?

 

[Belle427]

immobiliser problems normally give non start conditions, i dont see that as your problem. I cant explain why the car does it intermittantly though