Rough idle you say..

I thought that could be a rack-dampener screw. As far as rebuilt units-price varies greatly. If Rusty can get you a IP for $550, then so can Fastlane. They both use Worldpac which is the wholesale parts distributor.
For the rack dampener, do some searching on the list. There was an updated screw- they are painted different colors. Make sure you have the new one.

Michael

__________________
Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E