Intrestingly the engine management light has gone off since I had the battery off for a short while. I don't have a code reader but i'd like to know what it shows up now. My only other thoughts is the wiring to the injectors or maybe the new coil pack is dodgy? I can start the engine and run it but it sounds a bit rough and you can tell it's running on 2 due to the lack of power and the NGK plugs that are in plug holes 2 & 3 are like new and you can see they haven't been sparked at all. Plugs 1 and 4 are charcoal black which I think indicates too much fuel ?