I had one of those, mine was 93 Ultra.
Problems I had
1, When it would rain I would lose power to the seats and mirrors(I think).
2, When I would first start the car it wouldn't go into gear for a few seconds to minutes, it depended on how could it was out.
3, The oil gauge would read off the scale on occasions, very very High and sometimes very low.
4, Gas gauge also would read wrong, It would say your outta gas when your not.
5, Motor mount went bad standing in front of car drivers side
6, Harmonic balancer went bad and was noisey
7, Supercharger also made noise
8, Trunk seal leaked
9, Make sure the A/C works, mine had a replacement compressor in it.
10, I had trouble passing emissions once do to knocks I believe.
That'* about all I can remember. I had the car from 130K - 160K aside from those problems it was a great car, Good luck with getting it.
1995 Bonneville SSE ...... L36 3800 Series II N/A V6, FE2 3.06 gears .......... 224K
2005 F150 Lariat Chrome Edition . Trition 5.4L Modular V8, 4x4 3.73ls gears .. 44K
2001 Wellcraft Martinique 2400 ....... MerCruiser 5.7L EFI Bravo III ............. 220hrs