Cadillac Fleetwood
A lot of cars nowadays have variable displacement, or cylinder deactivation, as this saves fuel and the engine by not using unneeded cylinders when the car doesn’t need it. This technology wasn’t well-developed back when the Fleetwood introduced it, although you have to credit GM with trying to make it work. Made from 1976 to 1996, these cars had a slew of engine problems because of this feature. They jerked and made weird noises, which prompted many owners to go and shut off this system.