Im looking at a 1990 Gran Prix for my sister as a first car

Its got 140,000 miles on the car and has clearcoat issues, thats all the owner mentioned was wrong with it, while talking to him on the phone.
I've looked over several threads pertaining to the 1990, but i figured asking would yield better results.
What are the issues that 1990 GP have?
Fuel system?
Ingnition?
UIM???
Trans?
etc......