How about doing some diagnostics before you throw parts at it. First thing: You say it has a misfire. OK, a misfire generally involves ONE cylinder not firing every time - or firing weakly most of the time. Second: The things you are doing generally affect ALL cylinders - not just one.
Some things to go over: 1) a compression test will tell a lot. 2) Check for vacuum leaks. Around intake manifold in particular. A vacuum leak can cause one cylinder to "lean out" and fire erratically. 3) Spark plugs: By chance are you using champion plugs? If so, I can guarantee that you will never get a Ford to run right with Champion plugs in it. I'm not condemning Champion plugs al together, just that for reasons I will never understand, they DO NOT WORK in a Ford. Period.
There are some other things that can cause your condition, but then you are getting into major engine work. Items like a single broken piston ring. Or a poorly fitted piston. Or a bore that is out of round. Or a head that is built up with carbon to the point of significantly changing the CCs of the combustion chamber. In some cases, I have seen carbon built up to the point of hitting the piston at TDC and it would sound like a bearing knock.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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