I have a 2009 G6 sedan...randomly it has started making this awful rattling noise, it sounds like metal or something is loose...i cant pin point where it's coming from, it doesn't get louder as I go faster or anything...it's just always there. It doesn't make the noise if im just parking or sitting somewhere, only while driving. I can hear it with the windows up and down (it's not super loud) but its annoying and always there...any ideas on what this could be? I did just have my front & back brakes done but i'm not sure if it was there bfore hand or not due to the fact I heard the brakes squeaking before hand. Someone please help...before I blow this piece of crap up! I've had nothing but problems w/this thing.