Engine works stange at 900 rpms, please help with advice

[Porschev]

Dear Porsche owners
I am very new to Porsche Boxster, so could you help me please with one question.
Then I am putting my car to the neutral, the engine rmp drops to 900. However its not stay there, but rather increase periodically to 930 and back to 900. Is it normal, if not what causing this, and what I can do.
Thank you every one in advance.
Alexander Porschev.

[Brucelee]

It is normal for the Boxer engine to "float" a bit at idle.

Not to worry!