Since post, I have replaced muffler which was bad, and de-greased the engine to get a better view of whats going on in there. Nothing visually wrong. Before I drop it off at a shop I am hoping to get some direction instead of going in blind.
Still getting Check Engine Light and Code 52 (see above). I seem to get some hesitation at higher RPM's and fuel consumption has been excessive.....and at $3.29+ I can't go on like this.....
'03 TJ Sport on 33's, 2"BB, 1"BL, 1"MML