06 6.0 power problem cold
 

work for trucking co and we have 2 6.0 powerstroke. 06 and 07 and both have headache. 1st one did turbo and filters and aftermarket ficm and think 2 injectors. runs good but when cold, no codes. have let run like 20 min and when first take off. falls on face till goes thru a shift sequence, have make sure no traffic coming nd once goes thru like shift pattern to high ok as long as leave running. drive normal and such. just major power loss when cold seems till as said goes thru first up shift to high. starts good and such. no codes what confusing. found have problems also finding many scanners to communicate these 6.0. appreciate any help. that first one. ahhahaha
other one haven't looked at yet as dided, towed in , made bang now has like 10 codes for everything. ahahah