Misfire at cruise, popping/afterfire at 3000RPM

Righty Tighty said

@George Jets I'm definitely gonna pull the filter and cut it open, but I’m just going to plan on a rebuild at this point.

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Yes good idea.

You can bet the Rods and Mains and Cam Bearings are all going to be looking pretty tough too. The good thing is the soft bearings take the first hit, before the hard parts start going away.