Towards the rear of my 4Runner '93 3VZE engine there is a plug that I can't find a home for, can you ID it for me? Thanks. I am having a sudden problem with very hard cold starts and a code 22 for temperature sensor after I installed a new knock sensor and wiring to it. My engine wiring harness it trashed in all honesty, broken plugs, dry rotted wiring.

 

Coolant temp sensor I think. Sensor screws in to top of intake manifold in the back. I just ordered a new sensor for mine.