Where is the PCV valve on a 1999 Ford F-150 5.4 Liter V8?

On a 1999 Ford F-150 with a 5.4L V8, the PCV valve is typically located on the passenger side valve cover. It's a small, usually black, plastic valve. It might be difficult to see directly, as it often sits within a groove or recess in the valve cover. You'll likely need to look closely and possibly use a flashlight to locate it.