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If you are experiencing a vibration in your mooney like I was you need to read this. One day my plane went from flying perfect to a nagging vibration. I checked everything EVEN the sparkplugs. We removed, inspected, cleaned and tested the plugs they passed; we put them back in the plane. We bore scoped the cylinders, balanced the prop, inspected the intake manifold, mags, carb, EVERYTHING. Then we took a step back and reinspected the spark plugs.....one of them was a little dirtier than the rest...we further inspected the cylinder for sticking valves....then my mechanic was regapping the plugs and BINGO! The wire had a tiny crack in it almost impossible to see with the naked eye but was noticable because the wire was "wobbling" slightly when he regapped it. New plug.......NO vibration back to running like a clock! PERFECT! I hope this message helps others that are on the brink of madeness like I was trying to solve this problem. I even had a Mooney mechanice take a ride and fly it and he said it was normal vibration.....If you notice a change in your plane don't give up or think it's in your head. These planes will speak to you when something is wrong and my plane did..The connections I failed to make during run up were: one mag would drop 100RPM vs the other only 50RPM's. This was telling me it was ignition related and I failed to notice. I was asked what happens when I did a mag check and I said it was normal...lesson learned. I hope you all benefit from this..zoom in on the attached picture of the sparkplug you will see the crack.