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Mercrusier uses quite a few ignition systems in these engines. I would need your engine serial number to see which ignition system you have.
Then what you have is either a bad;
1. pickup in the distributor
2. ignition amplifier
3. ignition coil
To test it properly and not buy parts you don't need, you have to follow the troubleshooting flowchart. I have it here for you.
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Just follow the chart step by step, without jumping around, and it will lead you to the problem.
Post back with questions.