HOW did you "narrow it down"?So I’ve narrowed it down to it being cylinder 2.
From your scan tool photos, it looks like all the cylinders (1--6 shown) have occasional misfire.
Kinda surprised that with all the parts you replaced, plug wires weren't among them.I swapped around spark plugs and wires to be sure it didn’t follow and it did not.
If the valve stem seals are fouling plugs, sure. But from your description it doesn't sound like the plugs are getting that fouled.I did notice the spark plug was slightly covered in oil, figured it could be seals. Could the seals cause it to misfire?
That makes it harder to track down.It’s very intermittent.
Vacuum leaks have the greatest effect on smoothness at lower RPM.Also when above 1K rpms there are no misfires whatsoever.
Are you sure? A vacuum leak into the crankcase (problem with the underside of intake gasket) would be harder to spot with a smoke machine.I’ve confirmed many times with a smoke leak machine that I have no vac leaks.
Explain this photo:
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Is this showing extremely-slow activity of the two main O2 sensors? Is the scale at the bottom showing 41 seconds...42 seconds...43 seconds, and so forth? Or is that 41 milliseconds, 42 milliseconds, etc?