If you have durametic it would be worth graphing the misfires for all cylinders. With mine they sometimes reset back to zero while I am watching it.
Durametric will show pending codes as set codes so you should see anything there if there are misfires.
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2000 Boxster Tiptronic
2003 Boxster
2003 996 C2 Cab
2002 996 (SOLD)
1986 944 (gone but missed)
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