Thats a Bosch K-Jetronic system. Similar to any mercedes v8 of this era, or porsche, or many other european cars. Being it set for 10 years, my moneys is on it being clogged up from gummy varnish. They have a cold start injector. Maybe its spraying enough to start vehicle, but the main nozzles are clogged, not letting it take off on its own? Maybe bad warm up regulator? Bad fuel pump? Id be suspicious of a fuel related problem personally.