I have a 1998 c5 that is 2 bar Speed Density.Started running rich a few days ago and is worse. I have changed the O2 sensors and no change. Reset PCM and re-flashed multiple known good tunes. Checked fuel pressure. (55 Lb idle and 58 rev) When car is in open loop it runs fine but as soon as it goes closed its a real loss of power. -19 STFT!!! or worse. Map sensor voltage (2 bar) is .77 idle and 2.57 WOT and ECT seems to be working fine, no fluctuations. I do not run a maf or IAT sensor.
Here are some logs I have . I am stumped and need advice from more advanced tuner. The" new O2 log" did not have the lc1 wide band connected, I was just checking if I had a different STFT and I did not.