I have an automatic 1998 Jetta that is making a grinding/metal vibration noise every time I go past/stay around 2000rpm. The car shifts fine for the most parts but usually doesn't have a noticeable hard shift until 3000rpm. It has been like that for the past couple years but has always been fine but now I'm just worried with the noise. Additionally the check engine light is on but it has only been on after I disconnected the battery for the stereo about two months ago and this issue didn't appear until a week ago. Thanks!