Cummins N14 miss at idle

I am chasing a miss at idle again with my cummins n14. It is in a 98 fld120 425hp It will miss and sound like the motor is kind of loping after it warms up for a few minutes. It is pulling real good but sounds bad at idle. I have replaced the ecm, injector harness, and 5 injectors in the last 3 months. The 6th injector is 1 year old. When I unplug each injector, they all seem to make a difference in idle but I know that this is not the correct method since the Insite program isolates the amount of fuel going to each injector when doing the cutout test. I think that maybe I have an injector that is over fueling possible and causing the ecm to compensate fuel supply to other injectors but I dont know how to isolate this . If I set the idle up to 1000rpm it will run a little rough for about 3-4 seconds and then clear up and run smooth. I have been reading this forum for years and finding solutions from everyone's input but this is my first thread because I cant find where someone else has had this particular issue. Thanks in advance for any help

 

I ran overhead last week and cleaned filter on fuel pump. It was clean already. Fuel lines have been replaced within last year. I run ATF in fuel once every two weeks to break up any carbon.

 

Engine position sensor was replaced 3 months ago but I could try again and if no difference Ill keep it as a spare

 

When I put the new injector harness on it came with new pass thru connectors but I will check if any of them are taking oil.

 

fuel pressure is 150 at idle and 170 when at 1500 rpm