Help! After the organ smoke from the engine compartment -> SG dead.

Dear everyone, I would need your spontaneous assessment. After I got my well-kept Forester SG in October (here my first thoughts on it http://www.motor-talk.de/…/…nken-zum-forester-sg-t5828457.html?…) and now shortly before the brake change (drums/covers) and timing belts/WP change I wanted to do after three days, on which he stood again today a few completions with my Forester. Strong organs (so the battery still did) but otherwise only widiwiwididi widividiwidi, perched by a few tired and stinking spotters. Suddenly considerable (!) after rubber/plastic smelling smoke from the engine compartment…he came from the back area under the big black plastic box. Then of course dead. Now my question: What could be broken (or I have broken by 4 minutes of organs) and what was the “pre-weakness”? Why didn’t he jump into se first place despite the battery? He actually ran quite well – only last week I was a very restless , immature feeling made during the gas acceptance during the ride stunned . The idling and gas in idling were impeccable , but especially in the third quite between 2000 and 3000 tours there was a heavy imbalance to feel . Can this have something to do with it ? How do you appreciate this ? Thank you for your ideas and your advice and a nice evening at the moment Benno