I do think thats a good easy start, I'll check the pulley, I'll let ya'll know how that turns out!

 

The PCV valve ? Did that check out ? That would be an easier starting point IMO.

 

Anyone have an update on this? I have the exact same problem going on with my truck right now.
Is it possible to run the truck without the serpentine belt? I want to know if the noise is coming from the idler pulley.
Thanks!