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gizmogirl256
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gizmogirl256's post in CEL - Random Misfires '07 C4S was marked as the answer
Update! Finally got the car over to my indy mechanic. He was able to root cause my misfire problems. Note my misfires were always on one bank, cylinders 4,5,6. He talked to a Porsche tech and he first thought it was a cracked cylinder! That would have been painful! But one thing mine noticed was that the compression was high on all three cylinders. If it had been a crack, only one (or however many) would be showing a different pressure. That led them to suspect the Variable Valve Lift Control (Part: 997-105-301-00 Solenoid for Variable Cam Adjuster). Sure enough, they swapped it to the other bank and saw the behavior follow to that side. Ended up replacing that part and all is well. The part was only $130 but it was 8 hours of labor to debug and install.
It was going bad just enough so the failure was only showing at low RPM. It cleared up once the car was warm or at a higher RPM.