Ford Fiesta 1.2 petrol misfire on cylinder 4?

Can somebody help me? I have a Ford Fiesta that's missing on just cylinder 4. I have changed the spark plugs/coil leads/injectors and Reconditioned the head! But yet there's still a misfire on cylinder 4?

Did you check the valves (exhaust mainly
which can burn edges away. (while the head was off) re cut and grind valve faces and reseat them with grinding paste. They can look ok but may be burnt out under side. Also did you reset the tappets clearances to valves. If no clearance you will lose compression on a cylinder. No milkylook in oil( dipstick )check colour after running? Also do a compression test on all 4 cylinders to compare.

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