1LazyBmw - it was the CEL on the upper right of the display.
Warmtoes - I hope you're right about that CEL being the non-critical light, because I've been driving my car today and will be driving it to the dealer tomorrow morning (more freeway, which is where the rough-running issue seems to occur), and I'm just hoping that I'm not damaging anything. I don't think so, judging from how the car sounds and feels, but I'm no mechanic, so I don't know.
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