Hi guys. I've had my 2008 L322 HSE for just a few days now. It's been running great, but yesterday I went out to head to work and it was idling erratically accompanied by a whirring/humming sound. The idle seemed to work itself out, and didn't happen again throughout the day, but the sound is stayed. My first thought was the tranny, but it doesn't quite sound like the tranny whines I've heard before... but I've been lucky enough to not hear many. It also sounds more like it's coming from the engine bay. Any thoughts? I'll try to upload a few video clips (hopefully it works). The audio isn't the best, but hopefully it will be enough for someone to recognize.