My answer's gotta be a late 70's Plymouth Volare. I had one that had been a little old lady's car. Right after I got it, the exhaust system snapped on its own while parked when I met my parents for dinner. While the slant-6 itself was indestructible, everything around it was trash. I know at one point the carburetor started coming apart, causing it to stall whenever it would come to a stop.