I'm not sure how a failed PCV valve could cause that, but replacing it is one of the easiest things to do on a vehicle. I'm sure I've done it on my 5.3 but I can't remember doing it...that's how easy it is.
1. Remove plastic cover from engine
2. Pull hose off old PCV valve
3. Pull old PCV valve out of valve cover
4. Push new PCV valve into valve cover
5. Push hose onto new PCV valve
6. Replace plastic cover on engine