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Given what you are seeing on the tach I am thinking it is an electrical problem. Since it starts back up after you have the problem and then has the problem again later, intermittently, I would check your ignition switch - it may have an intermittent contact when in the run position. You might try starting it and slightly touching/wiggling the ignition key a bit and see if that prompts it to act up. If in doubt, check the connections on the switch and replace it.
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