How do you clean the EGR valve on a 1994 Cadillac devilled?

To clean the EGR valve on a 1994 Cadillac DeVille, first, disconnect the negative battery cable and remove the EGR valve from the intake manifold. Use a carburetor cleaner and a soft brush to remove carbon deposits from the valve and passages. Make sure to clean all the ports thoroughly, then reassemble the valve and reconnect it to the manifold. Finally, reconnect the battery and check for proper operation.