To locate it with certainty, you'll need to:
* Consult a repair manual: A Haynes or Chilton manual specific to your year and engine will have diagrams showing the exact location.
* Use an online parts diagram: Many auto parts websites (like AutoZone, Advance Auto Parts, etc.) allow you to enter your vehicle's information and view a parts diagram. Look for the EGR valve in the intake manifold section.
* Visual inspection: Once you've got a general idea from a diagram, carefully examine the back of the intake manifold. Look for a valve with a vacuum line and potentially an electrical connector. Be aware that it can be a bit difficult to see in this area.
Caution: The engine bay can get hot, so allow it to cool completely before attempting any inspection or work.