Hi and welcome to BC!
Sorry for the delay in answering. I guess we don't have that many folks with experience with the older models that come on real often. A couple things:
There are so many things that you should check: Fuel filter, sensors (check fo good connections and whether they are working), clogged CAT? for starters. I don't know what you've tried.
Do you know how to pull codes on it?
Have you purchased a Chilton'* manual for it? If not, I recommend you do so, not only for help on this prblem, but for all future reference. The $15 or so is money well spent and you won't regret it.
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