haVE U checkd the contunity of the wires from ecu to injector plug?
aka put the multimeter on logic and test if the wires are broken or bad connection?
probably not the problem but worth a try
i dont know about standard ecu's but my ecu will still pulse the injectors if it isnt getting signal from the ignition system
as my car wont start atm as, ignition is not working properly but the spark plugs are getting soaked in fuel