Need advice
ut new head gasket on Mercruiser 350 260hp (1995). Replaced plugs, wires, sensor assembly in distributor. Had it running great for an hour, and then it died. Checked all grounds, 12V to coil, nothing after coil. No spark. Motor has Thunderbolt IV breakerless electronic timing ignition. Any ideas why I don't have spark? Could it be the ignition?

