Hey guys,

Just recently my C230K has developed a vibration problem when idling in D gear...if you come to a stoplight and sit there with the foot on brake pedal in about 20 seconds the car starts having this vibration...you feel it on the upper part of your back in the seat and the vibration matches exactly to how the muffler vibrates if you were to go outside closely and watch it (fast 4 cylinder vibration type).

Im thinking a few things and yes I did do a search.

#1 - The ATF fluid was changed out less than a month ago (2nd time in car's life and I got about 90k now) - was done by an independant this time and took about a hour and 20 mins - could this be a level issue of the ATF causing this vibration? Car shifts smoothly and nicely.

#2 - I went to a drag strip with our local MB club not long ago and went 3 times down the strip

#3 Doing about 3 brake stands at the drag strip at around 1800 rpm - nothing major and first time I did this with the car

#4 Perhaps the original engine mounts are done?

Somewhat stumped but these are my most obvious clues...what you guys think? Thanks