I read your posts Mark and from what I understood from them was that the issue wasn't the throttle body as you said, "The new Throttle Body did not fix the issue. Looks like the smoke test & tightening of the ducts fixed the issue."
Peter
True, but what I am unsure of is whether the loose duct connections were from the factory, or possibly from the replacement of the throttle body. What I'm getting at is: Did the new Throttle Body fix the issue, but the technicians introduce a new source for the problem, by not properly tightening the ducts when they installed the new Throttle Body? I don't know. I all know at the moment, is that I've gone close to 4,000 miles since the last visit, with no problems. Going back to the dealer for my first oil change next week.
I haven't really seen how the throttle body is connected to the cylinders on a modern engine. In my mind, the throttle body (or carburetor on an older engine) sits on top of a fairly large piece of cast & machined metal (the intake manifold) that sits in the valley between the cylinder banks (on a V-design engine) of the engine.
I'm not certain that is any longer the case in newer V-designed engines, as installed in the 2016 Explorers.
Mark