[jdmccright]

You can gain some clearance by removing the black air intake resonator and tube section, and unbolting the throttle body. You don't need to unhook any of the cables, but disconnect the four vacuum hoses going to it from the EGR, VSV, etc, and the hose going to the valve cover. You can then move it aside enough to get at the nut with a wrench. The only warning is that you can hit a connector on the right side of the ignition distributor with a wrench, but it is rubber-mounted so it will flex some. However, for a really stuck EGR pipe nut, I'd remove the distributor too.

Use plenty of PB blaster, WD-40, and try some light tapping of a hammer against a screwdriver on the nut faces. Once you get it off, use a wire brush to clean the threads.

A pipe cleaner and carb cleaner is best for dissolving the carbon build-up in the EGR. You might try to remove the little pipe on the side for easier cleaning, but its screws are usually frozen by rust. Buy a new EGR gasket and throttle body gasket since they usually tear due to their age. Hope this helps!