Not being there I will have to give my "best guess"
That is, the spark plug in that cylinder is fouling out and I would replace the plug (maybe all while you're at it)
Here's what happens, when the coil fires the voltage is NOT instantaneously at say 10,000 volts it ramps up until its high enough so the spark arc jumps the plug gap. HOWEVER if there's a shorting fouling path in the plug (oil or carbon etc), as coil voltage raises current starts flowing through the shorting/fouling path WITHOUT ANY SPARKING and the coils HV secondary energy all gets depleted as I Squared R current through the fouling/shorting path with NO SPARKING. If you introduce the extra added gap, current doesn't get the chance to flow/discharge via the shorting fouling path. NOTE Its NOT that theres necessarily more energy, the coils HV secondary has a fixed finite amount when the points open, its that the shorting path isn't there to bleed off the energy prior to a normal spark condition.
There could be a shorting fouling path at a place OTHER THEN the plug, but Id try a new plug first. If its not that Id be looking at cap and rotor and plug wires.
MY GUESS IS THE PLUG IS FOULING OUT maybe others have other opinions????
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