9N misses under load

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Posted by Mark Case on Thursday, December 06, 2007:

Our 1939 9N has developed a miss under load. The miss was temporarily fixed with a new coil, plug wires and plugs but the miss has returned and sseems to be getting steadily worse. The #4 plug seems to be fouling and is likely the cylinder missing. We're debating a burned valve or valve seat problem on #4. Does anyone have any ideas to offer on a similar experience?

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