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My 1956 100 BN2 with M upgrades has a miss at speed the same feeling you get when running out of petrol but just for a second and then smooths out. This happens while cruising in or out of overdrive while at a steady speed. The engine has a smooth idle with no sign of problems but miss seems to happen at lower RPM while cruising. Number 3 plug has more carbon then the other three plugs. I wonder if a valve seal could be leaking. The other three plugs have a clean coffee color. Maybe that is my problem. Any ideas. Thanks Marty