Admittedly, I had the intake manifold off the car when I took of the IAC to clean in there, but it didn't seem like it would be a disaster to R&R it while on the car. It's just tucked down in there a little on the driver's side.
When I used to have the code for excessive EGR flow on my old 95, the car ran fine, and even got better gas mileage! A bigger problem at 200k is the EGR tube being clogged, of which there is no replacement, nor can it be cleaned on the car. I had four days of soaking that tube with heavy duty stuff to prove that! It is caused by leaky valve stem seals and high oil consumption.
97 T-Bird LX 4.6 - 80k miles
94 Supra TT Auto - street/strip car
04 CVPI- Brenda's car - 76k miles
95 T-Bird LX 4.6 - fully optioned, owned 15 years, 220k miles
96 Cougar XR-7 4.6- Brenda's car, owned 11 years, 187k miles
88 T-Bird 3.8 - first T-Bird, owned 5 years, 206k miles