Most of thease new engines have a place to unplug the injector harness from the car for engine removal. locate that plug --- unplug it and plug it back in --- disconnect the battery for 20 minutes and then connect it up again and go for a drive. (it could be as simple as that). Other than that -- now you begin to see why auto repair is exspensive. so if reseting the pcm didn't do the trick the do the following - yea its a pain - but unless you have ten grand to spend on a diagnostic tool--- this will do.
Ford uses a ground switched fuel injector signal. so with the key on unplug the injector and using a test probe, make sure all injectors have power to the positive pin (you'll know because the light will come on) if it does have power to all the injectors, then it may be a grounding problem, so switch your power probe to the positive post on your battery and check them all again (you already hve them all unplugged now anyway) if your test probe lights up --THEN THAT is the injector giving you problems - because the injector's ground wire is grounded constantly causeing the injector to inject fuel constantly.
to findout watch injector is Not firing --- start engine and unplug them one at a time, if engine does NOT stumble worse than it already is when you unplug the injector -- then that is the injector that is not working ----- that does NOT mean you really have a bad injector though - do the test above and if it doesnt check out then check the wires all the way back to the PCM Power control modual. If they are ok -- you better clean your battery posts and all grounds and --- make sure your battery is up to snuff and that the alternator is actually charging. (low battery voltage hinders injector preformance)