10. Disconnect the climate control vacuum hose.
11. Remove the idle air control (IAC) fresh air hose and disconnect the differential pressure feedback exhaust gas recirculation (EGR) sensor electrical connector.
12. Disconnect the EGR vacuum regulator solenoid connections.
13. Disconnect the IAC and throttle position (TP) sensor electrical connectors.
14. Disconnect the EGR valve vacuum hose and the evaporative emission canister purge valve hose and position them aside.
15. Disconnect the evaporative emission canister purge valve vacuum hose and remove the vacuum harness.
2004 Expedition/Navigator Workshop Manual
http://www.fordtechservice.dealerconnection.com/pubs/content/~WS4J/~MUS~LEN/20/S