[Gaz64]

Rick, could be a spark plug problem, swap 2 plugs first bank for bank.
Then if it's still the same bank swap your suspect carb with the other corner, levers should be the same.

Could also be an inlet valve guide / ring issue in that cylinder.

Test your leads as well.

Are you loosing any coolant?

You'll prove it to one of these after some swaps, best of luck with your search.