I changed the tune on my 6.0 this morning and it will not start now. I've tried to reload the Stock tune as well as several others and the ITSX keeps having issues with identifying the ECU. When it gets to the point were i turn the key on it just sits there like it does not see the key on.

Any ideas?

 

not had this issue with fords, but on dodges and chevys ive had problems where switching tunes the ecm locks up in the middle and have to take to the dealer to have it flashed.