I found a utube video by a ford tech that's explains a lot about ecoboost misfirings . I think all ford ecoboost owners should watch. roughly explains that there is a massive carbon builted up with cylinder heads 2, 3 that makes the misfires but the real issue is that he explains that ford Detroit has found out that is you do a induction cleaning that it will destroy the turbos which is not warranty approved and ford doesn't have a solution to this problem other then replacing with new injectors or replace cylinder heads every 20000 miles ( 30000 km ).
PLZ WATCH VIDEO at FordTechMakuloco or type in New Warning To All Ford Ecoboost Owners on utube !!!!