Your '95 has a wierd code connection. You need a OBD 1 reader that has cables for the OBD 2 connector, like the Actron CP9145.
Are there any other symptoms that you can tell us about? Any white smoke coming out of the exhaust on start up? How is your coolant level?
When was the last time you had a tune up or replaced plugs and wires? How many miles on it?
Any corrosion on the battery cables? are your battery cables loose?
As you can see, the more info you give us the better chance we can give you an answer you can use.
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