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Engines are balanced by cylinder firings being even, if you have one cylinder shut down that, especially if it's not always the same one, then the firings won't be even causing significant vibration. There are engines that have unbalanced firing orders like odd-fire v6's and three cylinders to name a few, but those typically have flywheels, harmonic balancers, balance shafts and other means to tune out the vibration. If the source of the unbalance is a moving target, there really isn't any realistic way to counter it.
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