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Hello, do you have the valve cover off then?
In order for me to call or text I have to send an additional service. It is the policy or I can get in trouble. If it's easier we can just chat on here
I would begin by using an ohm meter and test how many ohms each injector is. They should each be around 2.8ohms. Is the valve cover gasket from Ford or is it a molded one piece from dorman?
Hmm is the molded one piece gasket new?
When replacing it did it make a difference? The one piece gaskets aren't made very well and I have seen many failures. I won't even use them.
I am. Do you have a scan tool that can perform injector buzz test?
The very center wire which supplies the voltage to all injectors sounds like it has enough power to run three injectors but not all 4. I would run a jumper wire from the injector connector to the IDM and see if the vehicle will run all 4 injectors. If it does you need to find where the excessive resistance is inside the wire. If it still doesn't run correctly it's likely the IDM has an internal issue.