You can build the home brew code reader for cheap. I would pull the caps and look at them. Try lightly cleaning the contact points with an emery board. You can test the fuel pressure regulator by removing the vacuum line at idle. If it's leaking fuel its bad. The right plugs for these cars are cheap. I would pull one and if it looked bad spend 20 and replace them.

One baseline check. Look at the tag for the upper harness. Make sure it's been replaced with a post 1997 build.