Hate to suggest this, but what about a different throttle body that has direct support for the MS, like the 3.8 GM supercharged unit ( added bonus a good flowing MAS built on )?

It would have a much sturdier IAC setup that is easier to find & cheaper to replace.

Ed

Yankneck = Yankee ingenuity with Redneck stupidity.
"How can I break it better?"
89 Raider 3.0 w/ 31's for now