Have you checked for mil codes? (cycle key on & off 3x),
Swap the ASD relay
Test the TPS
Problems like this usually start with the everyone's favorite (CPS), but first start with the coil. Check to see if you have good color from the center wire to ground. (bright white, arcing 1/2")
swap the ASD relay with another relay with the same # (horn).
Then test the TPS.
Check your grounds to the engine block and inspect the battery terminals.
Change the CPS.
There is also a problem with the PCMs from 93-95. the capacitors in the computer module are known to go bad after many years of service. They can easily be replaced if you know how to solder (or know some one who does).
The caps in the PCM, hold in the ASD relay energized.
When you have your foot on the brake, do you loose brake pedal? A bad brake booster will leak vaccum , and cause the engine speed to increase slightly. Try depressing the pedal while in park and check for idle increase.