after writing the tune to my new unlocked ecm it will not start the truck, cranks for a second then stops. I can clear the DTC's and it will try again for one second then the same just stops. I went through the ECM swap process but while my tune was being wrote I put the old ecm back in the truck so I could drive it while I waited. When the tune arrived I just put the new ecm back in then wrote the new program. Is my issue being that I should have started at step one again and done the ecm swap process once more before writing to the new ecm? I also had an issue with the VIN number not being listed nust all y's but i was able to fix that issue.