Thanks everyone for the kind welcome!
Airman, I-O, and thanks for your service! I live on the faaar West Side, in Lincoln Village just off West Broad Street. I say far west, because anything east of...say, the Casino is pretty shifty.
Anyhow, my drivability issues came back with a frickin vengeance tonight. The only time it wants to fire on all cylinders is at WOT. Otherwise, it just wants to sputter and miss. It sputters and misses at anything less than 2500rpm when you stomp it...2500 rolls around, it's almost as though a switch has been flipped. It...barks, for lack of a better word, and will pull all the way to redline. It's also running hella rich because the burnt fuel smell coming from the exhaust would make a Saudi prince change pants.
Got the codes read on the way home, and got P0154 (O2; bank 2 sensor 1, no activity), P0140 (O2; bank 1 sensor 2, no activity), and P0304 (Cyl 4 misfire).
Seeing as how I am missing a huge piece of the fueling puzzle (my bank 2 upstream O2 sensor), I am going to have to figure out the bank two exhaust from the manifold back. The section of pipe where the upstream O2 would go is apparently not how it should be, so fueling on bank 2 is probably sketchy at best. I just don't understand why it would run OK for two days, then revert back to running like crap. If I have to take it to an exhaust shop, I hope I don't get reamed...
