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Yes, the compression test will tell you something. Sometimes it is that compression is OK, which rules out a lot of possibilities.
Black/gray smoke is often the result of a too-rich mixture. Not all the fuel is being burned. Why? Lots of possibilities there, too.
When you do the compression test, check each plug. Mark each with its cylinder.
Inspect for color, wetness, burning, etc.
Put in new plugs. Maybe ignition wires and a dizzy rotor, too.
After the episode, how did the engine run? Same as before or what?
Good Luck,
Bob
:>)
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