Originally Posted by Jbrew

How close is the ignition harness to the AC accumulator, the top of it ? While the truck is running ruff, pull the harness further away from it. If idle smooths out or deflects with movement, that's the issue.

The harness dips or loops down towards the accumulator there. With time or coming into contact with the top of the accumulator itself, the insulation may chafe and foil shielding damaged. In turn creates a magnetic disturbance and ignition havoc. Simply pull the harness away to confirm as explained above.

Originally Posted by Jbrew

Yea the damage occurs right where it loops over the accumulator. I've seen the loop resting on top of the accumulator in the past. Guy was coming back from vacation, was able to zip tie the harness back and away from it. Truck then ran fine , made it back home.

Originally Posted by BareBonesXL

Can you be more descriptive than "rough idle"? What idle RPM, it doesn't show on your screen grab? Is that screen grab at idle?

Your MAF reading seems high. Rule of thumb, apparently, is one gram per second for each liter of displacement. 1.0 lb/min = 7.6 g/s. My 4.2 idles at 4.5 g/s.

Probably help to describe how it runs and drives also, and if the idle "roughness" is at all temperatures or only hot or cold. The more information the better.

Originally Posted by JA86

Idle is bad cold and hot, but it usually jumps back into rhythm when I hit the accelerator. I just messed with the EGR vaccum solenoid, pulled the vaccum line off of the EGR valve and the truck ran way better...when I put the vaccum back to the EGR the truck almost dies and did die a couple of times.

Originally Posted by JA86

I'm not seeing any wires resting on it. However, I did pull the vaccum line from the EGR vaccum solenoid off of the EGR valve, and the truck jumped right back to a waaayyy better idle. So, I suppose that means the solenoid is bad? I tried putting 12v to it and nothing happened, it didn't make the "click" like the valve was moving. When I put the vaccum back on the EGR valve, the truck dies or almost dies.

Originally Posted by Jbrew

Doesn't have to be on it. To close to it. It's a magnetic disturbance. You have to pull it further away while running like I said. I guess you don't understand.

Originally Posted by JA86

Yes, actually I understand just fine. Apparently YOU must not understand what "there are no wires near it" means. Learn to read and comprehend before you open your jaws, mouth breather.