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- - What is this part? (https://blazerforum.com/forum/lighting-electrical-52/what-part-97999/)

What is this part?

I have a 99 Chevy blazer, so here’s the story. I got this blazer from a friend who said he couldn’t always start his truck and that after the car would heat up it would go into a limp mode thinking the car is getting stolen. He took out the attached picture part after his key fob stopped working. I got rid of the security light on pre ignition with a bypass part I bought and it started perfectly. But now I tried yesterday and it starts, runs for a couple seconds and dies. My questions are

what is that part?
Does that part have any control over fuel pump control?
Do I need this part reinstalled to make it run?

Please help! Thank you guys!

here are the pictures idk they can’t upload.

https://imgur.com/gallery/eUEDvHy

Is there no part number on the back? If there is, I'd start there with a Google search of the number.

Funny how much that box looks IDENTICAL to older DEI and Viper alarm/remote start/immobilizer boxes...

That being said, I would say yes, once you remove it, it's killing ignition and not turning everything on to make the truck run as normal (fuel pump, etc)