I tried looking at parts diagrams for the engine, intake, and emissions but I can’t find out what this is? If anyone knows what it is, do you also know if it is prone to failing? Seems like some kind of check valve or something.

Thanks for your guys replies. The only reason I ask is because when I was looking around in the engine bay with the truck running, I had what sounds like a loud air leak hissing near the throttle body and when I pinch the hose that comes out of that valve to the throttle body, it stops. All connections are tight. I was just curious as so that part and what function it serves and if air should be going through that all the time. Seems weird that there is a second source of air coming from the air box, through that valve and then dumping back into the throttle body when you have that huge intake tube to go through.

I really should. I just have that mindset where if something doesn’t feel right or sound right I should get it looked at before it becomes a big problem. On the other hand I know I have the extended warranty for another 40,000 Miles with roadside assistance so I should just drive it until something breaks if it will. If it doesn’t then I shouldn’t lose sleep over it. At the end of the day I now know what that part does! Thanks.