I took it to the :ford: dealer and they ran 5 or 6 tests on it to tell, You can take off the valve covers and unplug each injector while it is running and see if you can tell a difference in the way it runs, (flame suit on):nono:
Some people on here go crazy when you talk about that because the voltage can kill you apparently, and we are all stupid hillbilly shade tree mechanics if we even thought of doing something so backward and stupid.
Get the point of what people are going to tell you.
But it can be done, we did it to mine and we are still here. I would take it to :ford: though. The local dealer charged me 1/2 hour labor for running the tests.