Oops, I forgot to specify episodes again. This show only had one season, so they are all season one. The first four vehicles below appeared in multiple episodes. I have added the episodes for the others in italics.

"Freaks and Geeks" (1999) [TV-Series 1999-2000]
http://www.imdb.com/title/tt0193676/

1979 Pontiac Firebird Trans Am ****


AMC Gremlin *** (pretty sure 1974 Gremlin X)


Ford Maverick *** (1970, I think)


Buick Century wagon *** (I think, circa 1980-81)


1980 Chevrolet Corvette *** episode 12


Unknown ** ep.1


Cadillac ** ep.3


Chevrolet Impala (1968, I think) ** ep.14


Volkswagen bus ** ep.18


Circa 1966 Ford Bronco ** (I think) ep.6


Chevrolet Corvair ** ep.3


Pontiac LeMans ** (circa 1968, I think) ep.9


Ford LTD wagon (Country Squire, I think)** ep.10


circa 1975 Oldsmobile 98 *** ep.11


unknown GM sedan (circa 1978 Malibu or related) ** ep.14


unknown ** ep.17


Bus *** ep.18