Top contenders: A loose/cracked manifold that is tight against the head when first started, but warps when heated up allowing air to bypass the carburetor, allowing one cylinder to go lean and stop firing.
A spark plug with fouling that becomes conductive and stops firing when warmed.
A failing coil that is internally shorted such that it gets hot and reduces spark output which affects the weakest spark plug/plug wire combo causing the misfire.
For the manifold problem get it warm enough to mis, then spray non chlorine carb cleaner, or propane from a small hand torch with the burn nozzle removed around the the manifold to feed fuel into the leak. Do this outside!!.
For the bad plug possibility put in a new set. also check the conductivity of the plug wires. If resistor wires less than 7000 ohms/ft is required if wire, there should be less than 5 ohms.
for the coil feel it when it is misfiring. If it is warmer than reasonable, and warmer than its bracket, it is likely going bad.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
... [Read Article]
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