BMW 530i   1994 180,000 miles.
the engine either has an air (vacum) leak, I am unable to find a leak so I must suspect a switch. but which one ?.,. The engine sputters ( viberates) and will stall , I can hear the strang noise, but cannott trace it,/
There maybe a lot of miles on it but this car is in cherry condition,.
Thank you, Ed        ( Shadetree).