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			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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