Everything is new, including trans, electronic ignition, etc.Damper is one that came with the Mopar Performance motor.I guess that would be the easiest thing to replace right now, but I really don't think they built this with the wrong component.It is not any accessories because I already removed all the belts and it still vibrates. I will try a different ballast resistor, as suggested, what the heck, it is easiest enough. Everything else is new, including coil. It is so baffling, because it did this with the old motor, trans, converter, etc.