The plugs are located under a cover on the top side of the valve cover. To change the plugs
1) passenger side, disconnect battery. Remove the electrical wiring deal against the firewall. This is a box and a a electrical connection with 2 wires from battery.
2) On the valve cover area, remove two bolts, the one behind the cover area by the firewall is burried under hosed.
3) The panel will lift up exposing the 4 Coil over plug sets. Remove the wiring connection, pull the coil over plug unit out.
4) Clear out the hole as best as you can. Use a blow gun, sucker what ever you can . You don't want stuff going into your engine.
5) Remove plug. Install new plug. USE ANTISIEZE! on threads and recommend dielectric Grease on plug electrical connection
6) Repeat for all plugs.
7) On Drivers side remove the power steering fluid reservoir and the nut holding the bracket tight. and repeat remove the cover and do the plug.
Tools. 3/8s socket set with a LOT of weeble wobble extensions and universal joint.
is it normal when you pull the plugs out for the Sockets an extentions to be dripping oil like fluid, The navigator I bought the guy has owned since it had 40,000 miles on it and now it has 217000 on it and the plugs have never been changed, it runs fine with a little miss here and there, so we started with the plugs and that's what we are seeing while changing the plugs on the drivers side.