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Eddie, You may have either a defective spark plug or wiring. Allow it to miss for a while and remove the plugs to see which has the most soot. Then move that plug to another cylinder, run for a while and if it misses check it again. If the soot is the same cylinder, then start checking the wiring adn distributor cap. If the same plug is sooty, replace it. Another way to find which one is to start the engine while cold and feel the exhaust runners on the manifold or feel the sparkplug bases. The one that is the coolest is the one giving the problem. Sometimes these engines don't run spark plugs with hot enough range. A gasoline tractor engine typically has about 7:1 compression and 2500 RPM full speed. Hotter range sparkplugs often helps. I've had several Ford "N"s that ran kinda lousy. Everything was in spec, but just would be hard to start and not run smooth. I changed to a range hotter than the specification and the problems went away. It was the opposite when I was racing cars. A hot range sparkplug would cause pre-ignition on an engine with 11:1 compression. I would have to run a lower heat range than a street engine. Ken McWilliams
Dayton, OH
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