My 1998 Audi (60,000 miles/100,000 KM) has developed a bit of a vibration at idle. It disappears with any degree of acceleration. I had an Audi mechanic take a quick road test. He didn't think it was transmission related. He speculated that it could be an engine mount or a transmission mount. It could also be something related to the suspension however I think his first guesses are likely more accurate. Has anyone else encountered this problem who can shed some light on it.