We had a 115 do the same thing.
After a couple of weeks swapping powerpacks, unplugging plug wires, etc,etc, we found in a repair manuel somewhere how to test the powerpacks (gave resistance values).
The powerpack did work but had weak values at high rpms when warmed up.
Come to find out the first powerpack purchased was also bad, apparently someone used it, returned it and they resold it.
Try the cheap and easy stuff first (might as well call it annual maintenance), plus it gives you a piece of mind.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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