My apologies. I thought I had posted all pertinent information and had just assumed that describing the OBD code for cylnder #2 misfire implied that my SES light had come one. That was my fault.

Here's the latest update: I was so sure that this was a failing coil pack that I replaced the coil on Cylinder #2 on Friday. I then took a weekend trip and didn't even get out of the gas station before it happened again. Same thing as before, always when stopped and idling, never while driving. In this case, it happened twice, once while idling at gas station, second while idling at friends house after starting it to warm up. As before, idle drops slightly, can hear engine running different, SES light comes on. Step on accelerator and car is a shuddering mess with barely any power. Shut off ignition, turn back on, and car is back to normal.

A little more codes thrown this time though. Now I'm getting:
P0300: Random/multiple cylinder misfire detected
P0302: Cylinder 2 misfire detected
P0306: Cylinder 6 misfire detected

I also had a cylinder 5 misfire code before I erased them the first time. So, multiple cylinder misfires now instead of just cylinder 2. Really wish I had the other codes before I bought a new coil pack.

Now, I realize there are numerous issues that could cause random cylinder misfires: fuel delivery, vacuum leak, bad computer, etc. But, I'm hoping that these 2 symptoms can narrow down the list:

1. Only happens when idling and stopped. (Alternatively, it could be just at low RPM's for an extended period of time which is what idling is essentially)
2. Ignition off then on immediately solves the problem.

I would appreciate anymore insight someone could give.

Please let me know if you need more information and I will be happy to get/share.

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cmelkoni
2003 X5 3.0i, manual