84 Toyota Corolla SR5
Far and away one of the worst POS I drove for any length of time was that car. Over 100K kms it ate:
4 OEM clutches (and I'm not hard on clutches, my next car I never replaced the clutch in over 200K kms and My 1 ton has 160K on it without a clutch job)
2 water pumps(6! different kinds for this engine this year so make sure you get the right one)
2 OEM Alternators at $250 a piece. When the third one went I fabed up a bracket to mount a GM 1 wire unit.
Plus the factory tape unit died (not much loss there) and the drivers side seat back rachet broke.
It was a love hate relationship from the get go really. When I bought the car the drivers side window was busted. No problem I'm thinking, Corrollas are everywhere.
Did you know Toyota make nine different body styles of Corrolla in 84 and a drivers side window is unique for a 3dr coupe (not a 3dr liftback that's something different

)? Ended up having to order one from Japan and waited 6 weeks in December for the frickin' thing to come over on a boat. Good thing I only paid $150 for the car in the first place.
Honorable mention: 89 GrandAm with ABS. The ABS boost motor went and not only are they unobtainium used they cost $4000 new.