The 1994 4.0l uses the EDIS-6 system which is self contained and only has RPM advance on its own
The engine computer, the PCM, is connected to the EDIS-6 module to get the PIP signal(Crank sensor signal) so it can time the fuel injectors, and so it can calculate "vacuum advance" or Engine load advance, and it sends this "advance" to the EDIS-6 on the SPOUT wire(SPark OUT), on the EDIS setup the SPOUT signal is called SAW(Spark Angle Word), same idea, its the computers(PCMs) signal to advance, or retard, the spark based on engine load
If this SPOUT/SAW wire is disconnected then you would have slow throttle response, so no reason for you to disconnect it, but maybe someone else did or its broken
Diagram here of the wiring:
http://sideways-technologies.co.uk/forums/uploads/monthly_2018_02/IMG_0545.JPG.58e4c3c055ea42d52513fbacc34f38e1.JPG
The VR sensor is the Crank sensor
The 4 pin connector is the Coil Pack
The 12 pin connector is the EDIS-6 module
Pin 3 runs to Pin 36 on the PCM(computer) see if there is continuity on that wire, if not replace the wire