Missing on the Top end??????

[kirkm]

I have a older 9.8HP Model 110 that starts missing badly from half throttle right thru to the top end. I have already put in a fuel pump kit, a carb kit and new spark plugs with no luck. It starts great and runs great on the bottom end, what do I do next?

[boats.net]

Probably need to test ignition system to see if losing fire on a cylinder.