i am thinking that the ecu change is not going to help so a backup plan would be good
you need to have a jumper wire to atchet to 12 volt wire feeding the coils and injectors.
on mine it is the inside wire that feeds the 12 volts but i would confirm this by removing that wire and check with volt meter.
if you hook 12 volts up to the side the ecu grounds to make the spark then it might be possible to blow the ecu.
once it is jumped it may or may not keep running with the key in the off position. just something to watch out for
hth herman