So I've had my 2011 wrx since april 2011 and it has always had this weird issue where the cars rpms will drop below 500 right after it is revved or after coming to a stop and then go back uo and idle around 900 or 1k. It was always just annoying until today when backing out of a spot my car actually almost stalled (not my fault) because of this idle issue. Has anyone had this issue or know the cause and how do I fix it. My car is currently stg 2 with cobb intake and full tbe with a tp tune. I have like 25k on the odometer. Thanks.