Cm870 upgrades

[Running rough]

my 870 well now 871 will have a slight uneven ideal that is barley noticable, i would not call it a miss and more like slight uneven fueling between cylinders and same thing it has idealed like that ever since i can remember, i have seen numarous 870 and 871s in my area and guess what they all pretty much had that same ever so slight unevenness when sitting and idealing, my opinion is this if it is not bad like a 25 rpm flucutation then there is probly notting wrong, i have changed actuaters all new injecters, presure relive valves in search of that perfact ideal, the 871 870 with concept gears at operating temp is a quieter moter then my 2250 but the 2250 cpl3606 ideals 100 even and sounds more like a cat,i think its the nature of the desighn of the fuel system on the 871 870, feeding 6 injecters with 2 timing and 2 metering syliniods, if one of those timing actuaters sticks even slighty you will hear it on the ideal, it is kind of of funny though that with the mandate intact they same to ideal evener, it could be the backpresure on the engine, i am thinking, one thing is for sure the single overhead cam commen rail isx does have a more even ideal, from my experience anyways, but i still like those older ones to