Rough Idle, but not when off idle
 

So I have a 2006 3500 5.9 Automatic Bone Stock

I have been having a rough idle, but when you bring it just barely off idle it smooths out.

I have replaced the fuel filter sense it started. It isnt smoking any more then normal, like it would if there was an injector bleeding. I have not yet checked the fuel rail pressure. It hasnt been throwing any codes. It does it just the same if it is ice block cold or has been run for over 100 miles. The only out of the norm thing it is doing, and I havent pin pointed it yet, is a belt sounding squeal.

I was just posting if you guys had any ideas. I was wondering if it would be the pump, I suppose it could be a injector but I wasnt thinking so.

squeal on shut down? or while running?

I was actually able to get that to go away, it was just a belt squeal. and when it was doing it, it was while it was running

ok i was gonna say the shut down squeal is normal.

as far as your idle issue. are you able to check rail pressure? does it miss or any other weird rpm fluctuations while driving or only at an idle?
you could always try seafoaming the truck to and push out any particles that could possibly be clogging the fuel system up / injectors.. stuff works pretty good. and its cheaper then a full injector swap.. by A LOT..

I have been meaning to check the pressure, but havent had the time to do it yet.
When I changed the fuel filter not 500 miles ago I did just that and filled it with seafoam.
It hasnt been missing, It doesnt surge, there is no RPM fluctuations even at idle. It doesnt seem to do it while your driving, only when its idling, and if you do bring it just barely off idle with a little pedal it smooths right out. She has no problems getting right up to speed, or any lack of power when pulling a heavy load.
Is that your video?

try an additive, xdp opti lube, stanadyne, howes power kleener :tu: can't hurt!

Well I just noticed today that she is blowing some black smoke on the throttle when driving around. Now Im defiantly thinking injectors, right? I actually had just put in some cleaner this last tank, about a 1/4 left now.

well what is "on the throttle" if your at WOT its probably going to give you a puff. you can have a cylinder shut down test done too determine if you have a bad injector(s), showing any codes?

Thats what I was looking to find someone around here to do is to get a injector kill test. And no codes or engine lights.

thats where i'd start, until your sure try and let the truck sit, if an injector is stuck or over fueling it could wash down the cylinder.. :ouch: