wheres the pcv and breather located at on the truck in my sig? i was searching for a purolater air filter today and noticed they had pcv and breathers for cheap and i know mines probably never been changed so i may as well change them.

 

Pcv should be located in the rear passenger side valve cover. Breather element should be located in the air filter box.

Edit: I only recommend an OEM, Motorcraft PCV valve. No other alternative since it may allow for more vaccum through the valve. The PCV valve is a metered vaccum leak. I have used several different types. Each performed @ or below value. It's $7 for a Motorcraft.

 

How do you test your pcv? Whats symptoms of a bad one?

 

Here's a link and you can just type in "How to test PCV valve?" in Google for many related posts.
http://www.autoshop101.com/forms/h63.pdf

This link also gives very good info. Positive Crankcase Ventilation (PCV)