Then either I'm going to have to wait until it's shown in reruns on Superstation WGN, or dig through my videotapes for the episode, in order to refresh my memory. But what I do remember is that for most of the episode, it was this car.

http://www.imcdb.org/vehicle_79144-Ford-Mustang-2003.html

By the way, did you get my message about the image for the '95 Ford Explorer in the theme sequence, and the link to the 1950 Dodge Woody Wagon I've been trying to add? How about my e-mails on the other images from movies and TV shows?