I recently started having an issue with my A4 whereby the car runs/drives great, but when I come to a stop at a light, etc. it vibrates a ton. However, if I take it out of gear and into neutral (automatic tranny), it stops vibrating, but starts again when I pop it back in gear until I hit the gas. The vibrating (also mildly loud) doesn't go on until I get basically to a stop or maybe 1 mph, and goes away pretty much immediately when I hit the gas again. It has also begun to vibrate more when under load, such as when I hit a bit of a hill on the freeway and thus it has to put a little more power in to maintain speed.

Any ideas?

If it means anything, recently changed the oil, use the recommended high mileage synthetic, but it ran great, drove a few hundred miles road trip then this started happening, but worried it could be overfilled if that could cause it.

2002 1.8T w/131,000 miles

 

Sounds like it might be your engine mounts.

 

i would lean towards your snub mount. ITs located between the oil drain and the front bumper. U should actually be able to stick your head under the car if your undertray is gone and see it. NOrmally after a while the foam becomes brittle and will cause that vibration.