89 V2500 No TBI O2 sensor?

[GTSideSwipe]

Hi everyone, I just recently got my Suburban 4x4 with a 350 TBI and is running rich at idle and I cannot for the world of me find a o2 sensor connecter anywhere and there is no o2 sensor on the exhaust and where there would be one, it is just plugged with a pipe plug and looks original or has been there for yearsÂ…. So my question is did these come without any o2 sensor? And if they did, could one of you possibly post a picture of where the connector isÂ… thanks