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A very skilled Porsche mechanic told me that any time you have an engine (with Motronic) issue, to go through the DME test plan and 90% of the time you'll find the cause. I don't have a copy of the test plan, though I'm passively looking for one. Either way, I found it very reassuring advice. Most of my issues have been a bit of corrosion on a contact or a loose connection somewhere.
It could be anything but I imagine that a need for valve adjust would show up not just at idle, same with fuel filter, no?
Anyway, if you can get your hands on the DME test plan, that's where I would start.
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