Cummins n14 injector issue

Have an n14 celect plus. Slight random miss at idle. #4 injector failed injector cut out test ( no change to engine operation when #4 shut down. Swapped #3 with #4 injector. Problem still in # 4 hole.

Truck definitely idles a lot smoother before I open insite. Once I hit the start button without selecting any particular injector it has a bit rougher idle but it doesn't seem to miss.

New pistons and sleeves last year. New cam shaft this week. New cam followers this week.

Ready to send ecm out for testing unless there is something else I'm missing.

Replaced all Injectors last year with remans chasing this problem... still chasing

 

Just look at it or am I checking voltages or what?

 

Would you consider #4 the problem injector or does the computer do some sort of goofy balancing act and the actual problem could be an over fueling injector somewhere else? Would it be wise to swap 1&2 then 5&6 to see if anything changes or is that chasing unicorns?

 

Ok. I'll check the harness and pass thru.

 

I'm guessing that's the part # you are referring to.