i had the miss fire all last year and it did my head in .i put new every thing in 2 times over and i gave up on it then by look i got a new coil from a tat yard /im running wasted spark any way i put it on the car with the leads just lying all over the motor and it ran 100% spot on so i fort spot on so i put the car all back togever then went for a drive and fuck me it was back . its was put to me wot have you done in the last 10 min that may of done this so all the covers came off again leads all over the place and the car ran spot on . It was the leads ford leads out of the bags we had even run the car in the dark and on arking on the leads but under load they let go . so have a look in to it mate