You can adjust your TPS. 92 was the last year for that.
For the hesitation, it'* very likely ignition, not fueling. Wouldn't hurt to check your fuel pressure both cold, and hot when it starts acting up. However, it'* likely a plug wire or two, or a coil. Sometimes when they heat up, they drop spark voltage. Do you have the Magnavox or Delco setup? 92 was a mixed year.
If you have a Magnavox, now might be a good time to consider an upgrade to Delco. But you should still do your plug wires if you don't know how old they are, or if they're over 50k.
Your O2 sensor is probably due by now as well, but typically will run you rich, not lean. Most times it'* not performance related, but rather MPG related.