14: Pontiac Firebird
The third-generation Firebird was just as bad as its corporate cousin, the Camaro. The interior of the car was so cheap that you’d think you were in a bucket. Between the rattling of the interior and the lack of fit and finish, this generation of the Firebird wasn’t well-regarded. The four-cylinder version of the Firebird was equally awful (via Car Buzz).

The car had some of the worst reliability ratings of any sports car. Overheating is a major problem for these cars, especially with the 305 V8 engine. The best answer you can get from a mechanic for one of these cars is “they run hot,” a typical example of tragic GM engineering from this time period.