Intermittent misfire error after two attempts to fix

Touvcan invest in a simple hybrid compatible scan tool to scan it for codes.
If you still got oil getting into the hole, you may have a weak valve cover gasket on that particular spot. Have it replaced. But if after akk these, no improvement, I'd suspect the oil rings on that engine is weak already, specifically, on the hole you mentioned.

 

Do you ever open the hood and Clean the leaves out of the cowling?

It’s a maintenance thing. Had to do that many many times this year. Clogged cowling then rain water overflows the cowling dam and dumps right on top of the engine and right on top of the cops. Coil On Plug.
Hilarity and $$$$ ensues.

 

Since the repair attempts did not resolve the problem, we can conclude the parts replaced were not the cause, at least directly.

When plugs, wires or "coil-on-plug" modules are replaced two things are critical, both of which directly affect your moisture symptoms. 1) NEW boots must be used and 2) a LIBERAL amount of "di-electric grease" must be applied to the inside and outside of the boots. If boots are re-used, especially if the di-electric grease is not applied correctly, you can get misfires all over again.

Just because "new" coils were installed does not mean that new boots were, much less the boots were properly coated.