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A sudden increase in load can create a cylinder 'stall" requiring a hotter than normal spark to generate ignition. While it may be points related, the utility fours I've worked on (and the A4s too) would stumble when either the points had a bit of corrosion, the rotor discharge tip was burnt, the cap contacts were burnt or the condenser was on it's way out. Start with the points, Hold them open with the ignition off and pass a short strip of emery cloth between the closed contacts, look at the rotor tab and buff the tip with the same emery cloth, finally look at the cap contacts inside the cap, if there's any sign of corrosion or a dark line buff them clean. Put the rotor back on, screw the cap down ad crank her up. If this doesn't solve the problem then it's either the condenser or the coil. Replace the condenser next (cheapest first).Fair wind and a clear course!
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