Posting this for reference for any future searchers.

I was having an issue with my ScanGauge not communicating with the O2 and TPS sensor. I also had pending codes for high or low circuit voltage with fuel temp sensor and tps sensor. Randomly once it had a jumping idle but it didn't do it again.

Solution: check middle red plug on ECU. Turns out the vehicle can run just fine with that plug undone.

Hope it helps someone

 

Thanks for following up