Sorry for the delay, haven't been on here for awhile. We disabled the EGR's on both our '98 and '99 (identical as regards this issue). The wiring referenced in the "how to" thread is under the black plastic cover, under the hood on passenger side at base of windshield. If you jack up the car, remove the belly pans, remove the aluminum charge air pipe (from the intercooler to the EGR housing) you might be able to look up into the EGR housing to see if the valve is stuck. At that point you might just as well take the manifold off since it's just those 20 or so torx bolts along the head, a really annoying clamp where the EGR pipe attaches to the EGR housing, and couple of vacuum lines.

If I remember correctly, our cars go into limp mode if this particular code is tripped. Much reduced power and speed, higher shift points, etc. I'm surprised that doesn't happen to yours.