I would include here a careful visual inspecion of the #1 spark plug and #1 spark plug wire. While you are at it, swap the plug with any other cylinder if nothing else shows up.
Look for any build up on the plug. Consult a plug condition chart if necessary. Make sure the plug is gapped properly. On the plug wire, especially look for pin hole leaks in the area of the spark plug well. Sometimes they show up as a little white dot where it has blown through. The reason for swapping the plug is to see if the problem moves to the other cylinder as witnessed by the code next time the code is set.
If it gets down to the point that an injector is suspected, swap the injector with another cylinder to see if the problem follows the injector. Most certainly run a can of Techron or Red Line injector cleaner through the tank if there is any doubt.
I remember a case like this receintly that turned out to be a dirty connection at the injector. It was VERY hard to find. Final solution was very easy.
Also sometimes a revised engine calibration will have slightly looser misfire parameters. It is possible that there is really nothing wrong and the code is being set because the specs are too tight. It might be worth checking to see if the is a revised calibration that can be made. This must be done by the dealer. He must use the WDS, SBDS, or NGS to reflash the prom in the PCM.
Let us know what you find so that we all can learn.
By the way, the response from PA 3L SVT is excellent.
