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Well thenRemove 1 plug lead at a time and when the missing stays the same and dosent miss on 2 then you have the correct cylinder OR it could only be the plug faulty or lead ,but if none makes any differance then the knocking will be something else like Tappet lack of oil ,, valve hiting a piston, or timing moved.
Try all of the above and let me know how you get on . Ron
I had the same problem and found that the air admission tube was badly cracked.
Since this let air enter the engine downstream of the mass airflow sensor it is not measured so the engine ECU don't send the proper amount of fuel to provide the right air/fuel mixture. At higher RPM, the vacuum in the tube is enough to close the crack and hide the problem.
I temporarly repaired it with duct tape until I get the part.
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