I was coasting in my 06 sti with the car idling at about 750 rpm. I fully depressed the clutch and slipped the car into gear and the rpms increase to about 1250 rpm while the clutch is still depressed. It does it in every gear, the rpms stay high till i come to a complete stop then it drops to idle. Car only has 400 miles on it and completley stock. This normal? or should i take it in to the dealership?