The EGR valve on a 1997 Chrysler LHS (assuming the 3.5L V6 engine) is typically located on the
intake manifold, near the back of the engine. It's often somewhat difficult to access due to its location and other components around it. You'll likely need to consult a repair manual or a diagram specific to that year and engine for the precise location.
A repair manual with diagrams will give you the best view. Searching online for "1997 Chrysler LHS 3.5L EGR valve location" along with images might also be helpful in locating it visually.
