You said something interesting. You needed to change all the fluids, including gas. I would start with the fuel filter based upon that statement.
Secondly, I would check the OBD II codes and determine if the engine is throwing a check engine light (cel)...it most likely is.
Third, I would determine if the fuel delivery/spark system is working as well. Regardless of how much technology are in today's (or 96') vehicles, they all still need air/spark/fuel to run.
Also, check to make sure there are no vacuum leaks on the intake manifold. A way to test is while the engine is running, SLOWLY and CAREFULLY direct some propane gas towards any suspect leaks (rubber air hoses, etc). Personally, the safest way to do this is to get one of those oxy/acetylene torch kits that Lowes sells, and only connect the MAP or propane gas to the proper end, and direct the welding nozzle towards any suspect points. What this does is if there are indeed, leaks in your intake, the propane will get sucked in and cause the engine to rev (you are giving it more "gas" by allowing propane in the leak).
However, for your safety and those around you, do not EVER open a bottle of propane underneath your hood...if it catches on fire, you have more issues to worry about than just a rough engine. With the welding tip, if it catches fire, all you have to do is merely pull the tip away, and shut off the valve. Take your time doing this and make sure you throttle the propane so you can ignite it at the welding tip...that way you are not letting too much gas out at once, plus the flame will have a place to collect, should it catch on fire.
Start there. For a buck, you should expect to put at least $1500.00 in parts into this vehicle. Let us know how the project goes, we are here in case you have other questions as well.
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