S80 2.5 FT 2010 issue

[mr-bear]

Hi guys .
I have a Volvo S80 2.5 FT 2010 and it's a lovely car.... There is just one thing I am a little concerned about... When driving and holding the throttle steady en engine starts to accelerate just for one or two seconds the returns to normal... This happens both when the engine is hot and cold. The car hars about 92400 miles on the dial an it has been serivced as it should.

Any ideas? Any at all?

Best regards Patrik