Hello all. First off this is what is going on. Only at idle, the drivers side (left bank) o2 sensor states the car is running lean 160-170 blm. Drivers side is fine 125-133 blm. I have a y pipe from a 1996, so it has locations for four o2's, although my car only runs with two being that its a 1995. In place of the driverside rear o2, I have a wideband o2 sensor, and on the left side(passenger), just a plug. Being that the right side regular o2 states its running lean 160-170 blm, the wideband 02 states 13.1-13.4 AF, so if indeed the car is running lean, the o2 is doing its job and correcting the lean condition. Keep in mind the o2's are brand new. I have looked for exhaust leaks, none are present. I dont know what else to do as far as fixing this situation. Thank You BTW I have logs and all for anyone who cares to view. Thank You once again...