1995 m3 rumbling

[Athensm3]

Hey i've had my 1995 bmw m3 (automatic) for nearly a year a half and I have noticed that when I have it in drive and have the brake down, there's heavy rumbling in the car. Is this normal?? There are a lot of vibrations from the car. Should I get my engine flushed or what? Any suggestions?

[hc1001]

sounds like rough idle... maybe u need a tuneup or something... how does it sound when u have it in park?