On my 1985 300D the engine shut off went from working perfectly, to a slight hesitation to total failure in just 2 or 3 stop start cycles. As best as i can tell, the vacuum (measured on H.Fright vacuum squeezer), is about 7 or 8 inches of mercury. On my 240D, it is about 15. All the other vacuum related functions, are about the same as they have been since before the t.Rump regime. Shifts OK, brakes are fine, door locks semi work as always. Not sure how to diagnose. All the vacuum lines seem tight. Replacing the vacuum pump seems to be a nightmare. Is there anything else to check before contemplating the vacuum pump? Thanks!