Have you ever messed with a timing light and 93 octane before? Does wonders for these motors.
Advance the timing by turning the distributor until the starts to "knock," and retard the timing just slightly after that. Revv up the motor through the RPM range, and see if the revvs are smooth. That is essentially what many shops do on these OBDI systems. You don't have a carbs to worry about fuel, so it's simple with fuel injection (unless you have some weird piggyback or standalone, or an MSD 6AL ignition box). Reset you computer by unplugging the battery, then manually reset the idle.
Another tune-up that you can check yourself is the TPS. The throttle position sensor changes over time, and you should get a multimeter to check this anyways. The voltage should be between 0.92V at idle and then over for WOT.