Lincoln Repair Questions? Ask a Mechanic for Answers ASAP
When the engine is idling can you feel the number 7 injector firing? It should feel like a tap or tick in the injector- I usually just grab it with two fingers and compare how it feels with the other injectors. If you can't feel the click then the injector is either turned off (the PCM will do that if it detects enough misfires) or the injector is dead.