if it floods often change your fuel pump, i've seen some crazy shit & i know changing a bad fuel pump should clear stuff up you know, i mean it is a 20+ yr old car, might have the same fuel pump from back in the day, do you tune up as well.

As for running rich, check injectors as well, sometimes they are just dirty & need to be cleaned or flow tested to see what wrong with them.

Make sure you have a good O2 sensor as well, & like they said clean the MAF

& Sheldon said something about a pulsation damper, check it out as well, we wouldnt want to see a FC at the junk yard.