i swaped a 2008 ly5 engine and tranny and ECM from the same pic up into a older pic up i flashed the ecm with my vcm suite software and managed to turn engine on ! it will spark up and stay on for 3 seconds and shuts off ... any ideas as to what else needs to be done to the swap or ecm to make this work im losing hair and turning gray by the minute ........ thanks in advance ( fairly new to hp tuner software ) baby steps with it !!!!!