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Do you have a way to perform a manual compression test on cylinder 1. That is where I would start. If the cylinder is misfiring at all times I would make sure you have good compression. Especially since the new injector didn't fix your concern. The compression test is done by removing the glow plug from cylinder 1. You should have around 400PSI of compression on a good cylinder.
Was the wiring harness new for the FICM itself? Or is it the PCM to the FICM wiring?
Was this issue present before the FICM was replaced?
I would swap out the FICM with another one and see if the issue goes away. That is what I would do next.
Hello, were you able to correct your concern?