What's the best way to find a dead cylinder?

inertia said

Check/listen for a vacuum leak, plug any hoses to carb.
Wiggle carb for loose bowl/base, tighten base gskt bolts .
Good luck

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Spray carb cleaner around possible vacuum leak areas like carb and intake. If you notice a change in RPM then look closer for the leak.

Also, have you confirmed your timing and advance?
Good luck.