Will run great and out of no where its like someone turns the key off. checked Ficm (replaced ficm just incase) still doing same thing will run for days or min then shut down most time will start back up other times will take an hour. The only other sign it sometimes gives us is it misses/cuts out once an awhile and then usally with in sometime the truck will shut down, other times truck shuts down with no warning.. When its Cold it seems to run the best dont seem to shut down early mornings. Running a Edge chip checked for codes getting a U105 Lost communication with Ficm meaning?? Very frustrating please help any sugestions Thanks.