My 1950 farmall C has a zenith carb with only one fuel adjustment screw on the carb.
The adjustment is backwards from what you would think. Turn the screw in, clockwise, you make the fuel mix richer. I have my fuel adjustment screw turned max CCW. Look at your plugs. If plugs are black you are too rich. Start with battery voltage when running. IF someone converted to 12v, it is possible the coil isn't getting enough voltage.
Do a compression test. New plugs, plug wires, dist cap and rotor.
My farmall has a magneto. When I have an erratic misfire I have condensation inside the mag. The misfire happens after the mag gets warm and the condensation forms on the top of the mag cap. I use compressed air and dry out the mag.
Condensation under the distributor cab is a pain in the butt. Condensation caused an exhaust valve to stick on my Jubilee.
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Today's Featured Article - Tractor Traction - by Chris Pratt. Our first bout with traction problems came when cultivatin with our Massey-Harris Pony. Up till then, this tractor had been running a corn grinder and pulling a trailer. It had new unfilled rear tires and no wheel weights. The garden was already sprouting when we hooked up the mid-mount shovel cultivators to the Pony. The seed bed was soft enough that the rear end would spin and slowly work its way to the downhill side of the gardens slight incline. From this, we learned our lesson sinc
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