Discovered a twice-cracked PCV tube which was causing my engine to idle very rough, stutter, and occasionally, die outright at low RPM's. This video details the problem and a very simple, inexpensive fix. This repair covers the 2007+ R56 MINI Cooper S with the Prince engine (or frankly, any MINI with the turbo Prince engine).
If you have a rough running engine, a high mileage daily driver, or take it to the track, please consider checking this out and making this change. You won't regret it!