Figured out the problem. I am a dumb man. Three years of this engine being a PITA and it was the dumbest thing.
I don't even want to say what it was. Huge thanks to Lincoln for making me realize how dumb I am.
As my wife's granny used to say to me frequently, "Wellll stoooopid." (Read with a slowly delivered southern drawl.)
Now you absolutely need to share. How else will we be able to judge our current level of stupidity without knowing what standard was recently set by you.
I can, without hesitation, guarantee that I have done something stupider already earlier today.
bartamos