Thanks for the information.
I feel like I've been jacked by my garage. I feel they are the professionals and should have known about the issues with the 3.8l and the fact there is a TSB on the upper plenum. Although the TSB is just an advisory it seems like this is a leading cause to engine failure if not addressed.
What would have been the big deal about spending another 150 dollars on in for preventive??
That is where I think they failed and I feel like I'd like to go to court over it.