I had Phil test drive the Cobra tonight to see whether he thought what I was feeling was a missfire or a vibration and he says it's a vibration. My next step is to check the harmonic balancer to make sure the new one is 28oz and not 50oz. If it is then I guess from there the next step will be to check the flywheel. If both turn out to be correct then I guess the engine comes back out to have it rebalanced.
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