I posted this yesterday to another post and it could help here as well. In particular checking for vacuum leaks.
Had problems in the past with connectors- the ignition control module and the engine coolant temperature sensor. At one time you could buy both from Ford and splice into your harness. RockAuto has both connectors.
The engine coolant temperature sensor (MOTORCRAFT DY1145) monitors the temperature for the computer to set the fuel ratio.
I would look for possible problems with connectors, possible shorts in the harness where the connectors terminate including the cable junction to the O2 sensors.
Pull the vacuum line of the fuel pressure regulator. If there is signs of gas in the hose or the hose smells like gas, replace the regulator.
Look at the ground connections which are part of the engine control system. Make sure they are good. Keep the spark plug wires away from your engine control wires.
Run the engine on self test program. One part of his test checks the engine cylinder balance which may indicate a bad fuel injector.
Spray WD40 at suspected areas and see if the engine speed increases which indicates a leak. I would spray at the gaskets on the intake manifold as well as around the fuel injector o-rings. Install a vacuum test gauge to verify the vacuum is proper. Low vacuum may indicate a leak.