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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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