Air:Fuel Help. Cannot Get it Rich

Let's be careful here because it seems the carriage in the horse are both running neck-and-neck? We still haven't verified that the O2 sensor has been calibrated? We haven't put everything back together and drove a little bit to see if the plugs are doing anything different from any changes that are made or have been made? I guess what I'm getting at is let's make sure we're not making too many changes before we don't know what's going on.