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Glad to hear you found the leak -- the vacuum lines on the Cayenne are very complex, and can cause weird running issues when there are leaks.
Interestingly, my purge lines under the throttle body also found their way into the water pump pulley and got chewed up. While mine didn't get damaged to the point of noticeably leaking or throwing codes, it was pretty close to failure.
I spent today chasing down a vacuum leak that appears to have been the brake booster connection at the back of the intake manifold. I must not have completely seated it when I replaced the coolant pipes last month. Appears to be cured now, but interesting that it didnt throw a code or affect braking -- maybe because of the aux vacuum pump for the brakes on the CTTs. But it sure made the car run unevenly and shift poorly.
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