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Hello, was the IPR replaced as well? Did it start hard before all this work was performed?
Did the new HPOP have the update snap to connect fitting installed?
If that fitting isn't a solid pipe I would suspect it as being the issue. If it only happens when hot I would also suspect the ICP sensor is failing if you haven't done so already. The injector seals on top of the injectors aren't my favorite part to replace due to the high failure rate. I would suspect the snap to connect fitting as leaking though.