CRAP!!! you all ain't gonna believe this. I have 80K on my truck and shortly after my post above, my truck started to intermittently sound like a diesel at low rpm and then the oil pressure would drop to zero then recover. Pulled into Firestone and let them run a diagnostic check. Got a call this morning that they think it is the timing chain and there are chips in the engine. Recommendation... new engine. $11K installed! WTF?
Got online and it appears there is quite the history with cam phasers, etc. Now I am in a dilemma of what to do. Maybe limp it to the Ford dealer and trade it in? Suggestions?