rough idle

[timgco]

So, we have about 5,387 miles. We have had a rough idle from almost stopped to a complete stop. It's worse with the AC on. We took the H3 in today to get "THE UPDATE" done to the computer for this issue. They also replaced the battery. It had a bad cell. This took about 1.5 hours to complete and they sent us on our way. I went to pull out of the dealership and the truck almost died out. The idle dropped below 500 rpm. It normally stays about 500 or just a little higher while stopped but has a rough idle like it wants to die. The service guy tells us the compter has to relearn itself and may take a while. he also told us this update did not specify what it was for, but they would try this. This pissed me off because the service manager was off today, but told the other guy that we would be coming and it that he knew what to do. I wouldn't mind so much bringing it in, but they are over an hour away!
Also the tech told me that know codes got thrown. Wouldn't a code get thrown from the bad battery?
Does anyone know what the update is suposed to be?
has anyone had the update and fixed this issue?
Thanks,
Tim.