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Jeff,
It of course sounds like you have an imbalance in your fuel distribution. This has to do with runner lenghts etc. If the engine runs good and you can not solve the problem by staggering the jet sizes to lean out those two cylinders without causing and over lean condition in the other two that are feed by the same primary. I suggest you step up one heat range on those two plugs and try that. This should help your problem.
bkozlow
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