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I will throw my 2 cents in. Bought a Boxster that was taken in to get a clutch and the owner never paid the bill. Drove it home and had the same symptoms you describe. Took it to the local Porsche dealership and paid almost 200 bucks JUST to run the codes and tell me what they were and a quick once over. They tell me its setting a MAF code and I need to replace it. So i order one of the $125 ones from Pelican, plug it in an almost no diff at all. About this time I got the Durametric software, I ran the codes and it is showing me misfires on 5 out of 6 cyl. So either it wasn't showing them yet as the battery was dead and had to replace it, OR they flat out lied to me. Still not sure which but whatever. the car was leaking directly onto the Cat converter so as I would drive, I was also fogging for Mosquitoes everywhere I went. The dealership also quoted me over $2,500 to fix the leaking valve covers.
After I ran the codes I bought new spark plug tubes, seals, and the newer thicker style ignition coils.
IMMEDIATE difference. No more popping on start up, AND, hasn't leaked a drop of oil even after I bought the cam holders and such so i could do the cam covers myself. So far I have put almost 4K on the new plugs and have not had to top of my oil one single time and no stumble and pop on start up.
Not saying you have the same issue, but it seems that it took awhile to set a code on mine or the dealership only told me part of the story or whatever. Short story is I don't trust em at this point and have enough of my own tools to that I don't need em anyway. Between my best friend and me we have 4 Porsche cars/projects so I prefer to just buy my own tools at this point. But basically a good ole fashioned tune up solved a LOT of my issues. Who would have thunk it ????
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