03 KJ Gal
New Member
I have an 03 Libby sport. Had a misfire in cylinder 4 a week ago. Replaced the plug and coil. Engine light cleared itself. Week later engine light on. Misfire codes on cylinder 3,4,5,6 also O2 sensor code. Drove a few miles after the code reads and now codes po837 & po838 popped up. Any ideas?? I do all my work myself so any guidance is welcomed!