2005 D/A 21000 miles 3000 miles on fuel filter
Today I came to a stop light and while I was waiting the engine started running real rough. I looked in the passengers side mirror and there was blue smoke coming out of the exhaust.
The light change to green and when I started the engine continued to run rough for about 3 seconds. Then it ran fine.
The next 3 stop signs and at home I let it idle for a few minutes everything OK.
What happened? Do I have a potential problem?

potential bad fuel. try some stanadyne

Samething happened to me, thought is was bad fuel, changed fuel filter and did the standyne thing. Quit it for a while, then it came back. Took it to the dealer, he thought it may be a injector out of balance, when they check it out they found a issue with the software or computer programming they updated that and now it runs great. He said there is a bulliten on it.