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jglaze
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Rough Idle Stall since Rain
in 997-1 Series (Carrera, Carrera 4, Carrera 2S, Carrera 4S)
Posted
What year is the car? I've read on a number of other forums about the potential for bad valve lifters on some '05 cars, which demonstrate similar symptoms you describe (cold start, random misfire). It seems like its a fairly rare issue, but common enough for Porsche to issue a technical bulletin.
I'm particularly interested because I just passed on the purchase of an '05 S that developed a random misfire under exactly the same circumstance as you (cold/wet).
Good luck!