Well, I missed your other post, but I'm sure we can help you out. Since you mentioned that "all" you had was an OBD2 reader, you may already know that what you need is something like an Actron CP9145 with the OBD2 cable adaptor. Your '95 is the wierd year that has OBD1 codes and software, but an OBD2 connector.
You need to consider replacing both the UIM and the LIM gaskets ASAP. There'* tons of info on here, but start by reading this whole TECHINFO Article 38
BTW, where do you live? There may be a member close by with a code reader that will work.
Mike: 1997 SE w/ 183K, aka White Horse
, Gutted Airbox w/K&N, drilled 180* t-stat, tint all around, clear corners w/SilverStars, "PONTIAC" light up tail, PEMs, NGK TR55s