Motor help

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79 evinrude 70 hp
Motor is cutting out on top end but doesn't stall. I can troll all day with it with no issues.It will fire up and run for a while on the top end then after about 60 seconds then will just cut down to a high idle. Has no misses.
If it was a carb issue and the high jet was plugged it wouldn't even get to the top end right?
If it was a ignition issue and a coil pack was bad wouldn't you be able to hear that clynder miss?
If it was a fuel pump issue I wouldn't think it would...

Motor help

Motor help