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It is in the front of the engine, to the right of the thermostat housing.
drivers side rear valve cover. top.
In the valve body, under the oil pan
If the 4.3 Chevrolet engine is new enough to have an EGR valve it would be located in the exhaust pipe where it meets the engine. Some vehicles did not start using this device until after 2000.
Valve cover
The evaporative emissions (EVAP) canister purge solenoid on a 2003 Chevrolet Silverado 1500 with a 4.8 liter engine is located behind the throttle body, near the front of the engine. I have a picture of it that I could send to your email if you want.
The EGR valve is located on the top of the engine. Drivers side at the back of the engine. It is held on by two 10mm bolts.
look om the passengers back side of the valve cover. You need to take off the vortec cover.
You did not say what size engine but in most cases the PCV valve is in the valve cover.
The EGR valve is located on the passenger side of the engine on a 2006 Silverado 2500 HD 6.6 turbo diesel. A bad valve will cause the check engine light to come on.
It is right beside of the thermostat housing, Right side of it. 2 bolts hold it on.
The 1997 Chevrolet blazer modulator valve is located on the firewall in the engine compartment. The valve will be on the passenger side of the firewall.