If one lobe on the distributor cam (for #2 cyl.) was wore down, might prevent spark at low RPM and allow a weak spark at higher RPM when points "bounce"...possibly? Just trying to think what would tie it to only #2 cyl. spark. You might check clearance of points on each distributor cam lobe or at least #2 cyl. and a couple others to see if any variation is apparent?
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