The 06 silverado 4.3 does not have a PCV valve.
Yes.
Ther is no PCV valve on a 06 silverado with a 4.3L engine
The PCV valve is found in the valve cover on the passenger side.
No there is not.
on the back of the gas tank
It is stuck in a rubber hose and pushed in the top of the valve cover
Drivers side valve cover towards the firewall.
Loosen the bleed valve
2012
The most common cause of that is a bad EGR Valve.
The schrader valve on the low pressure side of the system.
They are hydraulic, self adjusting.