Q: What's wrong with this lemon

I just bought a Nissan Quest, quick test drive at night on a dirt road. ( I felt like I was being rushed) ANYWAY. I picked it up today after I registered etc and I drove 15 miles and my car died. I obviously don't have any history on this car. But when I was driving it seemed like it was getting loud ( like a hole in the exhaust, or almost like a car that doesn't want to shift like a high rpm noise. It didn't drive "rough", you can tell it's age though. ANYWAY. I was driving and came to a stop sign, and I realized the van stalled, and was smoking from the engine. (Black smoke) had a burn smell to it. It wouldnt start, and I could tell my battery was dying quick from trying. BUT before getting to that stop sign I felt like I heard a light chain rattling noise (not sure if that helps) Anyway it got towed until I can get it checked in a few days. What seems to be the issue.

My car has 190000 miles.
My car has an automatic transmission.