One time glitch or.....
 

For the first time ever I took my '05 S80 on a road trip, I've never left Dallas'Ft Worth in it!
So my 24 year old and I are going south on I-45 at 3:00 AM in light fog, 80 mph, no problems. All of a sudden the engine misses, CEL lights flashes and then the car runs great the rest of the trip.
Dealer can't find a code, but I'm concerned as I have to go to gGalveston this weekend and thought I'd drive it.
Any ideas?

Drive it. Anything could have caused the hick-up. If the issue was so fast that the computer could not pick it up it may be a fuel delivery problem. Like a fuel pump issue.

Older Volvo's have problems with fuel pump relays going bad for months before they fail enough to diaonose the problem.