Need help 84 500SEL

[bus63kombi]

So I picked up an 84 500 SEL German grey market car. Very nice shape but has a couple issues. So when I try to start it, it hasitates and dies, you have to push the accel down a little bit and it will start. It then idles rough. Sitting in park once it warms up you can rev it up and it smooths out. When you put it in gear you can punch it and it does hardly move and blows a good amount of black smoke. I can tell there is a few vaccum leaks.
Anything else I should be looking at?
Thanks
Cheers
-Cary