Chevy & GMC Vans

Was buttoning up adding some hose clamps to my vacuum lines earlier and noticed the sensor in the picture and I'm assuming the vacuum line connected to it is correct and maybe the whole reason I was stalling in hot weather but wanted to ask what the sensor is exactly. From what I can tell it's an EGR module but please correct me if I'm wrong

Always include your vehicle info in every post please.

I would guess it's the temperature sensor since it's next to the thermostat.

All engine sensors are listed in the service manual that was provided to you before. (charm.li)