My 94 740iL has a slight rough idle, hot or cold. The tachmeter does not move or jump around to indicate a sensor malfunction. I feel the rough idle. I can phisically see the rough idle when the hood is up because it shakes. No idiot lights are on!

What could this be? Motor mounts? what is your 2 cents?

go to www.e38.org and search for IDLE, a couple causes are discussed