98 w900 keeps cutting out

W900 n14 cummins 13spd

So we've been chasing this problem for a few months now.
The truck rolls down the road alright but will just randomly cut in and out. I took a video (for sound) that will show kind of what's going on.

We have recently replaced the main engine wiring harness, new fuel pump and fuel cutoff solenoid ( even though my truck doesn't use the solenoid to shutoff).

But the truck still cuts in and out. Has a hard time pulling hills even when empty.

We're possibly leaning towards the throttle pedal but im just not sure. Anything else could look at to figure this out?

Links below are of the exhaust where you can hear the cutting in and out.

https://youtube.com/shorts/8cClN1XpxhQ?feature=share

https://youtube.com/shorts/y6JWfNUVqUw?feature=share

 

No, it's only while driving unfortunately. Wether I'm empty, loaded or bobtailing.

I can sit and revv it up with no cut outs though

 

The ecm. I'm not exactly sure ehst it does but it's set through the ecm.

I can take the wire off that solenoid and remove the guts out of it and the truck still shuts off

 

Well we figured out the issue and it isn't one that I would have ever thought about it.

Turns out the coolant level sensor had a wire exposed and was grounding out from touching one of the AC lines. Hasn't missed once in over a week now.