Hey Yogi,
Sorry to hear about your troubles there!
That's a hell of a blow out on the mileage.
Here I thought I had my own lil gremlins to deal with occasionally but seems one has cropped up into your engine bay too now!
Well at least with you personally having recently stripped the engine right back, you'd be in the best position to hopefully identify where this problem lies or has come on from after all...
Best of luck with it and here's too a speedy recovery back to the good times again!