judder or shake

I recently had my car serviced at a local garage. Immediately after getting the car back, I noticed the car would judder when idle. The rev counter hovers around 6000 but when the judder occurs it drops down and back up again. The judder is ever so slight but noticeable. I took the car back to...

Hi guys, im new here so please go easy on me :) Well, i have a 98 528i auto with 140k miles on it and i love it, but it has a problem. When i turn the key it fires up straight away no problem but after a few seconds when the idle settles it gets very lumpy and shakey (if you leave the door open...