Hoping to revive this thread as I'm having a similar problem. New o2 sensors all around (4 total; ntk per
@Jerry Bransford recommendation), new cat-back exhaust (original cats), new plugs, cleaned out iAC last summer, smooth idle, no codes (now that I've changed the o2 sensors). I don't know if acceleration is strong or weak b/c I've only ever driven this TJ - it's at least consistent in the 18 months I've owned it. Temp seems ok, just between the 1 & 0 of the 210, though I've read that it should be b/w the 2 & 1...not sure if that's a big deal? I have a replacement thermostat (per recommendations by users here: Superstat 195). Haven't checked the IAT sensor to see if that's sooty, but I might replace it b/c I don't know when it was done last.
So I just swapped hard for soft top in preparation for the warmer months to come. While driving or idling, I'm overwhelmed by a smell that I think indicates that I'm running rich? Not burning, but it's like someone took the odor knob on the exhaust smell and cranked it up to 11. Make sense?
I also decided to track my mpg for the first time and am currently tracking to about 10-12 mpg (4.0, manual, 180,000 miles), which is lower than I would have expected.