I have a 2000 S10 ZR2 with a stock L33 and flashed 0411. Cats are in with NB O2 bungs on both banks. WB bung is on bank 2 near the NB bung. HPTuners MPVI2 with AEM 30-0310 UEGO.
The WB sensor reads 1.3 Lambda at idle and 1.5+ under load then maxes out at 2.0 on deceleration. Makes no difference if I force closed loop by disconnecting the NB O2 sensors - reads and runs the same. Plugs are not showing any unusual signs of lean or rich but misfire current/history both show frequent misfires on all cylinders (more so on 3 and 4 for some reason). Occasional P0172 code (bank 2 too rich). I've checked for vacuum leaks and I have no reason to think I have bad injectors. AEM WB checks out with open air calibration. The truck runs but runs poorly. My aim was to touch up the tune but can't get past the crazy high EQ numbers. I can share a short log if that helps with diagnosis.
What am I overlooking to have such high EQ readings?