O2 sensor question

[95 V6 J body]

zero is lean

That kind of makes sense then. Having one O2 sensor disconnected is telling the computer that 3 cylinders are running lean when they aren't, so it's giving more pulse width on them.

I'll have to check the output on the one that's there. Hopefully it's not the 5V version, because that means it would be telling the computer those 3 are running rich when they aren't. Thanks for the help.