Wow, what a struggle to find the problem. This will be interesting to find the cause.
The best clue is No CEL. There are only a few component faults that cause bad running but do NOT set a CEL after the problem is detected 3 times. That may be a good basis for a google search ?
I understand why you want to inspect the injectors but you my find them difficult to remove. Each injector has a tiny screen in it -they may be plugged?
Good luck and let us know your progress.
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