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

RustyRatRod said

As easy as the plugs are to get to, I'd just run a compression test.

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Rusty, that would be my third test.
1st: pull wire off each plug, one at a time. (this will tell you which one)
2nd: remove valve cover and check rocker arms movement. (possible problem)
3rd: Compression test. (possible problem)
I like the easy-peasy first.

Question was, "how to tell" not "how to fix".