you could still have bad gas in the tank. Put some Heat it in for a couple of tanks to help get any water out.
Could also be a loose ground wire. But as a test I would put it in neutral when coming to a stop and keeping the rpm around 1k to see if it happens.
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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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