Where is the PCV valve located - exactly.

Since you provided us with no engine size, I assume it is a 5.3

Removal Procedure

Remove the intake manifold sight shield.
Remove the positive crankcase ventilation (PCV) hose from the intake manifold fitting and left valve rocker arm cover, if required.

Remove the PCV tube (1) from the air cleaner outlet duct, if required.

Remove the PCV tube (1) from the right valve rocker arm cover fitting (2), if required.
Remove the appropriate PCV hose/tube from the vehicle.

Installation Procedure

Install the appropriate PCV hose/tube to the vehicle.
Install the PCV tube (1) to the right valve rocker arm cover fitting (2), if required.

Important: Route the PCV tube between the engine harness and generator battery jumper cable.

Install the PCV tube (1) to the air cleaner outlet duct, if required.

Install the PCV hose to the intake manifold fitting and left valve rocker arm cover, if required.
Install the intake manifold sight shield.