Hook up the pump to the only vacuum port on your EGR valve. There will be a small hose attached, that you will need to disconnect and install your pump onto the same port. With the engine running at an idle you should be able to pump the vacuum pump to create vacuum on the EGR valve. The diaphragm inside the EGR Valve should raise and cause the car to die. If your car does die then your EGR Valve and it's ports are fine. If your car stumbles or doesn't have any change in the way it runs when you're pulling vacuum then you probably have a bad EGR Valve or a clogged port in your intake.
If you think you have a bad valve then you should take it off the engine and test it with the same vacuum pump. You should be able to see the diaphragm inside the valve move as you are applying vacuum. If the diaphragm does move then you may have clogged ports in your intake and may need to have the intake cleaned. If it doesn't move then you should replace the EGR Valve.
