When you have a miss that only affects one cylinder, you can mostly rule out things that will affect ALL cylinders. A coil will affect ALL cylinders. A Carburetor will affect ALL cylinders. A distributor problem will affect all cylinders as well. Those are all places NOT to look for the problem. I can almost give a 100% guarantee that you will NOT find the problem with an item that affects all cylinders. Having a distributor or coil affect only ON E cylinder and only when warm is a very unlikely possibility.
A warped manifold is one possibility. A bad wire or plug is another. A vacuum leak from an unused vacuum port is another possibility. Valve clearance is also a good possibility. If a valve is too tight, it can cause a loss of compression on one cylinder. Look for things that will only affect ONE cylinder.
Some suggestions are to do a compression test. Better if you test it while it is warm and acting up.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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