Going to try the O2 sensor trick before having it towed to a muffler shop for a pre n post pressure check on the cat. Two seasoned mechanics have said it sounds like a partially plugged catalytic converter.
Timing could not be any worse for not having a running truck. Had a woodland fire kick off due to a complete moron F-in around with a turkey fryer (allegedly). It is only a couple miles away and our son fell in the eminent evac area, by getting a warning. It was fast moving, rugged terrain and headed right for us.
He is all hooked up ready to punch out. If it reached us, the truck is out go-to for hooking up a small utility trailer and such. Now it gets real, in getting it up and running.

They hit it hard from above including a DC-10 and we passed this big boy headed up the hill.
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