Success! Got the MAT sensor to read. it was my wiring. Had to rewire the 5 V reference into the sensor like an actual smart person. I tried calibrating it per the OE GM sensor settings and it read -1, and then switched it to your recommended settings and it was ~86 (its 65 here and the car is cold) I ended up massaging the numbers to get it to read the correct ambient temperature. I think I need to look up the sensor brand's resistance settings. It's not an OEM GM part. Anyways, here's a cold start log. Mega rich at idle, and my wideband is taking forever to read correctly. It bounces around during warm up. Thanks for the help!!!!