Hi! Just got my first jeep ever! YAY!! FINALLY!!
Anyway, she`s an 04` 4.0
She`s showing system too lean bank 1. Not sure what this could be? Checked for vacuum leaks, replaced fuel filter but cant for the life of me find a test port to check psi?? Any clues?? Also sounds like a ""knock" & has small miss when idling but runs great. Not sure where to go from here. She also just had a tune up, timing chain & oil pump. Any help would be appreciated! Thanks!!