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My worst car ever!
The worst car I've ever owned was a 1981 Ford Escort GLX. In fairness the car never left me stranded, however, the engine and transmission are about the only parts that didn't completely working at one point or another. Power everything changed to non-fuctional (doors, seats, windows, rear-defrost, cruise, etc...). In addition to an electrical system that just turned of sections of the car on its own (yes I checked the fuses), mechanical parts rotted off the thing at a rate that would amaze even someone that has owned an orignial Scout.
My mothers 1978 Toyota Celica GT. This car left me stranded everytime (I'm not exagerating) I drove it. Belts, pumps, fouled plugs, whatever, the car seemed to know when I was exactly 3 miles from the nearest phone.