Well, TKR had a cliff-hanger ending. In the last ep, a big bad guy in a wheelchair (I think his name was Mobius, but don't quote me, it's been a while) got onto Sky-1 (The plane) and stole the computer out of the conference room console. The computer was a green glowing orb of circuits which had “K.I.T.T.” printed on it and about 4 red lights scanning back and forth. Then the team went to a certain destination, found a headstone to the memory of Micheal Knight, and finally turned around to a man in a leather jacket saying “I'm Micheal Knight.” …End of series.
I think the evil car your thinking of in TKR was KRO or something like that - their evil black sports car which had to be destroyed.
And Ghostbusters213, I had my doubts about the Shelby as well, but I thought it worked very well for the show.
For those who haven't seen it yet,
nbc.com has it up to be streamed. Also, they are re-airing it in a “special presentation” tomorrow night.