How do you change an EGR valve on a 1996 Cadillac Eldorado?

To change the EGR valve on a 1996 Cadillac Eldorado, first, disconnect the negative battery cable and locate the EGR valve, typically found on the engine's intake manifold. Remove the vacuum hose and electrical connector from the valve, then unbolt it from the manifold using a wrench. Clean the mounting surface before installing the new EGR valve, ensuring the gasket is in place, and then reconnect everything in reverse order. Finally, reconnect the battery and start the engine to check for proper operation.