I have a 2009 A5 with the 3.2l v6. It just started to do this annoying rattling sound at idle. It almost sounds like a loose heat sheild or something on the exhaust, but it got away completly as soon as i touch the throttle any. Does anyone have any ideas to what could be causing this problem? It seems to be coming from the drivers side rear of the end of the car. It only happens at idle too... Ideas?