Hi I have a focus 1.6 on a 2001 plate and when u sit at tick over it goes up and down like its hunting its got a sports decat and strat thro exhurst systerm wod this make it do this and I have the normal alarm and its had another fitted I think they r working agaest each other because u unlock with the other alarm and it relockes itself u have to keep pressing it about three times then it stays unlocked so can anone help me plz