general problems of the 2005 Ford E-450

I have a 2005 Ford e450 cutaway 6. 0l diesel engine and it will shutdown completely during normal driving conditions. This condition was diagnose by a certified mechanic as a problem w/ ficm & pcm computers both where replaced by us. The problem continues and after long hours of research found recall campaign (05v270000) call Ford and they informed me this vehicle was not included in the recall. This failure occurs aprox. 15 min after driving at normal speeds. We have employees who drive this vehicle and were close to have very serious consequences that can cause major injuries to the public and our employees.