I have a Seat Toledo 2300cc V5, year 2000, which has a problem with misfiring/no power. The problem tends to manifest itself when the car is cold and really only in cold weather - particularly bad when freezing. The local dealer had cheked out the car and can find nothing wrong - fuel filter changed, plugs and leads changes, a sensor control/junction box changed and still there is a problem. Any ideas, could it be the fuel injectors? Or the coil pack?