I have a 2006 Cadillac DTS LIII. Occasionally the check engine light will flash, the service stabilitrak message and service traction control message will all come on at once. While this is happening the car runs very rough. It usually lasts under 5 minutes and then it goes back to normal and the check engine light stays solid for a while then even that eventually goes off. I did check the code while the light was on and it just showed a single cylinder misfire. Had it to the cadillac garage and they said it would actually have to be doing it while it was there that they didn't see anything wrong with it. I just now has 100K and I have owned it since it had 40K. I am at a loss since the dealer doesn't even know what to tell me. Anyone ever experienced this combination before?