Sounds like a vacuum problem. So you have a hole in one of the vacuum lines, line disconnected(seen it) or a bad supply pump. Also you may have holes in the Y connectors. Also the vacuum actuators in the door mabye faulty

AS for the sound do you have anything on?

__________________
1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)