with multiple misfires I wouldn't be driving the car. it looks like you're misfiring on 4,5,and 6, which are all on the same bank, iirc, though I'm not sure. it could be as simple as the electrical connectors on the coil packs are not connected properly, at least for the misfires (not sure about the other codes). who did the tuneup? are they familiar with porsches? what all was done in the tuneup? I don't see how telling you to continue driving the car with multiple misfires is a good idea.
I'm sure someone with some more info will chime in...
-jimmy
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