2000 boxter, rough idle but no CEL

[Janner]

Thanks for the reply.

I will try the 'remove filler cap while running today'.

I don't know the answer to the MAS, the car was purchased about a year ago. Supposedly it had all service done by the Porsche Dealer in Naples at the required times and intervals, at least thats what the records say.

The oil added was about two quarts, but I may have overfilled the oil.

Janner