Does this look like a faulty O2 sensor to you guys? Damn reading is all over the place. Wiring is free of any sources of EMI/RFI. Even disconnected the alternator belt just as a sanity test. When the temp comes up to 160 and closed loop learning starts I can't keep it running unless my foot is in it.

Edit: forum resizes the image so it's hard to read. Yellow is AFR and green is RPM.