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The PCV valve on a 1999 Astro should be located on top of the valve cover. It plugs in and can be easily replaced.
The egr valve on the 1999 vortec v6 is bolted to the intake valve. It is just behind the distributor.
If it has one, it will be located on the fuel rail.
Its on the passenger side of the throttle body.
EGR VALVE IS LOCATED NEXT TO THE TOP RADIATOR HOSE AT THE ENGINE, IT CAN CAUSE ENGINE TO MISS, STALL AND SURGE.
It is built into the oil pump.
Not exactly sure about a 99 but almost all cars it is a valve that goes right into to your valve cover around where you fill your oil.
where do I find the egr valve on a 1999 Chevy Cavalier?
The ERG valve on a 1999 Chevy Express van is near the carburetor. It is bolted on the intake manifold.
Driver side on top of intake by firewall.
R134A
The PCV valve is located in the valve cover