How do you change the EGR valve on a 85 Toyota Tercel?

To change the EGR valve on an '85 Toyota Tercel, first disconnect the negative battery terminal and remove any vacuum hoses or electrical connectors attached to the valve. Next, unbolt the EGR valve from the intake manifold using a wrench, and replace it with a new valve, ensuring a proper seal with a fresh gasket. Reconnect all hoses and connectors, and finally, reconnect the battery terminal. Start the engine to check for proper operation and ensure there are no leaks.