i took my stock van tune and loaded the alternate lbz tune on efilive, i then used the edit pull down menu and copyed the entire segment of the "lbz engine operation" the checksum value changed after saving the tune and to confirm that i infact copyed over the "engine operation" section of the lbz time i reopened up this tune i just saved. sure enough the id changed and the checksum is now the same as the lbz tune values all others are the same as my stock van tune. also the calibration file .cal changed to the lbz # of 12606128 from 12606129 that of the van tune. now, when i loaded the tune into my truck the key is completely dead, meaning it will not even try to start. the engine operation of the tune was the only thing changed. can anybody resolve this and why is it doing it? btw passlock is disabled. i figured since the engines of the van and lbz are identical this would be just a program change, but something is shutting down bigtime, also no dtc to speak off.