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Russ, I had a similar problem with my N. Low RPM miss, Idle jet has no effect. High speed OK, Low power. It turned out that there were bad valve seats that were affecting the vacuum at the carb and screwing up the mixture. I ended up rebuilding my engine completely. To determine if this is your problem, do a compression check. It will be obvious if that is the problem. Also the manifold can be drilled out and a vacuum guage can be attached if you are so inclined. I didnt do this but if my problems persisted, I would have. Another trick to determine if there is an intake leak is to spray the manifold with carb cleaner with the engine running and see if that affects the miss. If it does, then you have found the problem. I went through all of the above but the valves were my problem. The rotators froze and the exhaust valves and seats burned and the compression went away. I hope that this is not the problem because it is a pain to fix. Good luck and let us know how you make out Joe
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