2000 Mercruiser 350 MAG MPI on Vdrive Pulled rider today about 20 minutes, then when idling to switch out rider, engine started to run rough and stopped, would not restart with repeated tries. Started paddling toward shore (fun fun fun)and after about 15 minutes, tried starter again and ran like a champ. Zipped around lake a few times but when we got back to lift, it starting running rough again. Looked over the engine for a few minutes before seeing arc at the coil. The coil has center wire to distributor cap, and two smaller wires, one left, one right side. Arc was going between left side wire and center. I stopped engine right away and when I moved center wire, it came right off leaving connector behind and looked slightly burnt/crusty(?) inside. Any input on if this requires a new coil or just wires, or bigger issue causing?
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