> I then checked all plugs and found No 3 to be 'sooty' while all the others
> were clean burnt light grey colour.
Are you using the stock manifold with PCV valve intact? If so,
then the #3 is where the oil blowby will be deposited, causing soot
and eventually wet fouling.
You can, for a while, help the problem by running a hotter plug
in #3, but you should be planning and saving up for rings.
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