Done
http://www.imcdb.org/vehicle_225644-De-Lorean-DMC-12.html

I did think 4 stars because of how it was part of the plot, but thought it as more three stars based on how much it was used.
After it was first seen at the beginning for a minute it wasn't seen again for like another 10-15 and then used until the end of the ep.
But since its part of the main plot i guess it deserves 4 stars.

3 star? No way, that's 4 stars for sure, it's central to the plot and was used very extensively.

Good episode by the way.

Here is a 3 Star Delorean DMC-12 from a recent episode of American Dad, Ep 4.16
http://www.imcdb.org/movie_397306-American-Dad!.html