PROGRAMMING
I know the manual says that you need 2 programmed keys to add another, but on a feeling I tried the old method: Insert programmed key in ignition and turn to run but do not start engine. Turn off and remove key. Within 15 seconds, insert new key and turn to run but DO NOT START ENGINE. Antitheft light should be on and not blinking. Turn off ignition. New key is now programmed.
EDIT--After a bit of research, 97s have what's called PATS I. This means that if there is at least ONE programmed key in memory, you can program up to 6 more keys into memory (The 2 from the factory + the 6 you can do.) By what I can tell, 98s have the PATS II which have to have 2 programmed keys to be able to program the others. Reference:
http://www.1-800-pdq-keys.com/news.htm