its been warm outside so I been driving with open windows and I noticed a weird noise coming from the car seems like its coming from the engine but I am not 100 percent sure it happens when the car slows down at around 1000 rpm and starting around 25 mph and down. Its either a rattle or sounds like the car is starving for fuel and is going to stall but I looked at the rpm and it does not fluctuate. As it slows down the sound goes a way. IF you drive with windows close you don't feel or hear anything. Could it be the way active AFM is deactivating. This is my second G8 GT it has 27k mikes on it . I don't have any lifter tick or anything like that the motor sounds fine. My first car never did this that's why I am concerned .