Interesting comment about SCs running better w/o sensor. I observed this years ago & so left my ‘82’s 02 disconnected. My theory is that the SC’s simplistic 02 circuit is only used to lean the mixture out for emissions. Disconnected the 02 & the system seems to maintain a more opportune air/fuel setting. I had to lean out the car for state emissions anyway so never bothered to reconnect. Only 1 more cycle & the ’82 falls off the fed radar anyway. Comments from CIS gurus