I added the pictures, but some where already listed and others not worth listing: the first limousine is just a block thing, to look like the Lincoln/Cadillac limousine, but nothing precise; the background Ford is probably made to look like a Taurus, like the other that is listed.
http://www.imcdb.org/movie_385690-Family-Guy-Presents--Stewie-Griffin-The-Untold-Story.html

Heres cars for this movie.

Lincoln Limousine? ** 00:01:48

Hummer H2 ** 00:02:20 (Clevelands limo)

1966? Ford thunderbird * 00:06:50 (joke of the Thelma & Luise jump
scene)

Harley-davidson * (joke of Easy Rider)

Ford * 00:11:53

Toyota Prius II ** 00:27:52

Ford Econoline **** 00:43:02 (picture 1)/ 00:48:10 (picture 2)/ 00:48:24 (picture 3)

Car **** 00:46:29 (picture 1)/ 01:15:51 (picture 3)(peter griffins
car)

1992 Ford Crown Victoria *** 00:51:54

1994 Ford Taurus *** 00:52:05

Car * 00:52:15 (the red one, an austin or morris I think)

1997 GM EV1? *** 00:56:20

Fire Truck * 01:09:24

Fire Truck * 01:20:28