Sometimes stalling when stopped or sputtering when accelerating from stopped. Comes and goes but get's more frequent in the drive. Got a code P0131 02 Sensor 1. I replaced it, same issue. I unplug the 02 sensor and it will run. I thought it was the harness on the vehicle and had dealership take a look. They did an overlay on it "as a start". They said it was done, I kept asking about the 02 sensor before pick up. "It's good, we drove it, etc.". After pick up about 12 miles later I stall/sputter. They say it's the ECM and Cat. Converter.

Looking for second opinion.
I've replaced spark plugs, wires, coil. MAF, MAP sensors. Purge valve.