My truck is a 2015 Cummins deleted stock tune. I never pulled the EGR off the truck; I just unplugged it.
Driving home today, it started shaking ruffly at idle (it almost felt like running a dozer).
When I stopped for a few minutes, I noticed it smelled like raw diesel and had a small amount of white smoke.
I shut it down and turned it back on.
It came back.
I drove for a few more minutes, and it all cleaned up and returned to running normally.
I did have the batteries out of the truck for a couple of days; one of them went bad, and I had to replace it.
I don't know if that possibly caused the computer to do something weird.
Do you have any thoughts about a stuck/bad injector?
I never noticed the coolant level going down.
It has around 75k miles on the truck and hides in the grade during winter.
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