Your EGR is a normally closed valve that modulates using a controlled vaccuum to admit exhaust gas into the intake. The solenoid blocks the signal at idle and low rpm, as I recall. You can unplug the solenoid, or unhook and plug the vacuum line to the EGR diaphragm if you don't want to pull it off and block the holes with a blanking plate. If it's not functional it's ugly sitting there.