Firing on 3

A&Q about 350Z
Q:

Hi, hubby's G-reg golf cabriolet is firing on 3 cylinders. The dodgy one was covered in a burnt deposit. Changing it hasn't helped. There is also an intermittent tapping sound coming from the fuse box - which may or may not be linked. Probably not much to go on - but any ideas? Thanks in advance.
A:

Changing what? the pot?
Got a spark there?
A:

the tapping sound is prob a relay going mental
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