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Hello and welcome to just answer, my name is ***** ***** master tech hear to help. I cannot see or hear your vehicle so I rely on your input so I can help you better. I read your notes and have a question before we start. Did your vehicle have an engine light on before you replaced the ECU or now?
So does it have an engine light on now?
Can you isolate which cylinders are effected/
Have you got a vacuum gauge and a tachometer?
Ok I would like to do a vacuum test on it first to see if there is any vacuum leak. Then if that checks out to move the injectors that are bad to good cylinders to see if that miss follows them.