Hey Friends, here is an update on the outcome:

The dealer kept my X5 for a couple of days. When I got the call that it was ready, they told me everything they had worked on. Everything ELSE that was on my list. So I asked about the rough idle, and their response was, "Oh, let me check and see what we found out." Turns out, they upgraded the software. Okay... nice enough offer... but seems to be the easiest solution. So I said I'd drive it for a few days and see if it was any better at cold starts. At first, everything seemed great. Smoother shifting, better gas mileage, smoother starts, etc. I was actually pleased and almost dropped you guys a note to tell you. HOWEVER...

Yesterday morning, 30F degrees out. Started the car, and "The Jalopy Syndrome" was back and as strong as ever. Shaking back and forth, sounding like a Harley Davidson motorcycle but not as loud.

I am taking it back in tomorrow morning. Apparently, the SIB, the suggestions from you guys, the print out I gave them didn't seem to help. They went with the easy way out. I would like to ask if you guys have any more thoughts, shoot them to me. I'll bombard these guys with suggestions and tell them to keep the car until they have fixed it!

Thanks again, friends.