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So...you have two plugs that aren’t making a difference once the boot is removed?
Are you sure the boots are on the plugs correctly, and those two boots aren’t switched? The correct order is 1-2-4-3...it says so right on the side of the motor but is easy to forget, and a lot of engines run surprisingly well on fewer than 4 cylinders.
A frequent cause of an unhelpful spark plug: stuck valves. Measure the compression, treat fuel with a double dose of MMO, and try to bump the valves down with an Allen wrench through the plug hole before becoming a head surgeon.
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