Yeah my car does the same thing... It's intermittent for me though, so when I took it to the dealer they weren't able to duplicate the issue. If stomp on the gas a little bit it goes away. Try it. I don't think you have too much to worry about.
2005 BMW 645CI - 20 Inch ADR Classic - Matte Black Side Fender Grille - Matte Black Front Grille - 20% window tint - Smoked tail lights - ACS Paint - Britalman full catback exhaust system - H&R Lowering Springs - aFe intake - Sprint booster - Ram air induction-Headers - MTEC white Angel Eyes - Two Alpine 12" Type R subwoofers - Rockford Fosgate T10001bd Amp - Escort Passport 9500ix Radar detector .
2005 Mustang Saleen
2005 Cadillac Escalade EXT
2007 BMW F800ST