hey guys first time poster...recently bought a audi a4 3.0...dont realy know if i like it or not...anyways after the car is nice and warm and has been ran for a while when i go to put it in park or in neutral the rpms start dip and come back up and continues doing that untill i put it in drive again...but if i give it a little gas when the rpms are erratic it levels out...any one have any idea what it can be...i would appreciate the help..