What component is this, it's function, and how do i test.
 

https://cimg5.ibsrv.net/gimg/www.yot...024a2da269.jpg
What is thia component, it's function, and how to test for correct funtioning.

it would help to know what engine and year you pulled it off of.

based on the vacuum line it looks like part of the emissions system

1995 pickup DLX xtra cab 4x4.
22re
Attaches under the intake manifold. Vaccum hose and coolant port.
https://cimg4.ibsrv.net/gimg/www.yot...1b21233882.jpg

That would be the PAIR valve.

How to by pass: https://www.yotatech.com/forums/f116...-r-vsv-269799/


FSM: http://htftp.offroadsz.com/marinhake...20pulsedse.pdf