I have a 81 300D with 305K miles on her. She runs great except the delay between all gears causing me to let off the accelerator allowing it to shift. This happens in all gears and at all temps. I was thinking it might be a vacuum problem, as was suggested by the guy I got it from. Is vacuum something which controls the tranny? The door locks and moonroof also don't work until the car is running, unlocking the door in the morning won't unlock all doors, and moonroof won't function until the car runs a little while. If vacuum runs these things, as I am thinking it does, maybe it also controls the shifting????This is my first MB and I like it a lot, but the shifting isn't very flattering . Any advice is welcome.