As Yal stated,
I suggest the ignition distributor is checked first, focus on the rotor bracket that connects the rotor to the cam. The early ones were aluminum and tend to break. Symptoms are: no start, with intake puffing/backfire, as if timming out of whack. Replace with steel one from MB.

New torx bolt torqued to 16 Nm.

Hope this helps,
Acky