The 3 major sensors for fuel control that are capable of "black rich" are Map, Coolant, Air Charge.
As far as I know T-1 did not use an Air Charge Temp Sensor.
Since you have an Air Charge Temp Sensor code be sure that is a "hard fault" (happening now) and if so diagnoise and repair that fault and go from there.
Backprobe the connector with a digital voltmeter with the key on and compare the voltage to the voltage chart in the engine management section.
If the voltage is out of range unplug the connector and probe the 2 terminals with the key on, it should read 5 volts, if ok replace the sensor.
If it does not read 5 volts check the reference line(signal) and ground(signal return).
After completing the repair be sure the plugs are not fouled and that the oil is not fuel diluted.
If correcting the code 23 does not improve the condition check fuel pressure.
Static pressure is 53-57 PSI.