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Hello, until the air in bled from the system the ICP will be slow to build. Does this still have an EGR valve in it?
was the oil changed after all of this work?
What is the ipr when it begins to run rough?
I don't see any videos. If it's running good while cold but begins to run rough when hot I would suspect one or more injectors were beyond trying to clean. How much fuel pressure do you have? The fuel pump can also be losing pressure.
It's possible it's just one injectors causing issues for the rest also. It's hard to know for sure.
It's very possible when assembling the injectors torque is important. If tightened to much it can prevent the spool valve from working correctly.