misfire p38

Hi, just wondering if anyone has had this sort of problem,have changed plugs, leads,coilpack but still nothing, it runs but not very well,if you take of lead 5 it doesn't seem to make much differance,take of lead 3 it gives a hell of a kick,the sparks also look very erratic,done a compression test all are very good, number 5 plug is also black, regards

sorted problem out, it was a wire on one coil pack faulty.