S65 rough when accelerating

Check engine light came on and when I accelerate it feels very rough. if I just maintain my speed seems ok.
Also saw a spot of oil by the rear drivers side tire.
I am bringing it in on Tuesday to the dealer but wanted to have an idea.
Coil pack and strut?
2006 with 71k miles.
I am going to pick up a code reader this afternoon. Will see what it says.
Read the code and it is P0309. Cylinder 9 misfire. It was listed twice, Confirmed and pending. I cleared both codes and it started up and was smooth. I took it out for a 20 minute run and no issues.
The odd part is when the light came on I wasn't pushing it. I was idling along at maybe 10 mph as I pulled out of my driveway.
Also where is the best place to order these coil packs/ignition transformer? A quick search for the part I found(000-150-02-58-M22) showed only one place selling it. The coil packs seem to have a few manufacturers. Any reason to buy one over the other?
Sorry for all the question's a search showed some sites but perhaps I am missing something on the part numbers.
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