I'm thinking the IAC valve I got is bad... Possibility? Anyway to check?

 

That has happened. Was it a mopar brand? Our trucks prefer them. Without looking at a svhematic, I know you can apply 12v to two of the contacts and watch extend (or contract, my memory fails me right now). That is about the only test but I would replace it just for grins.

And clean the seat for the IAC inside the throttle body.