got my check engine light this morning in traffic

[D-Lux]

I got the Engine Light Warning this morning, idling rough, turned it off, let it sit, tried again, same thing. Called OnStar, they didn?t tell me anything, accept take it in to the dealer NOW. I was still able to drive it, but the computer limits your power, so I could only do a slow crawl down the feeder roads, until I got to the dealer, luckily for me it?s only 5 miles away. They haven?t called me yet, to tell me what?s wrong. When they do I?ll try and keep you informed on my outcome.