2013 Peterbilt 587

2013 Peterbilt 587 Last 8 vin# 185213 / PACCAR motor

My company bought 4 of these in 2013, all with PACCAR motors and a few years later after I came back to work for them these 4 trucks have been deleted. That's just for history info. 3yrs ago I came back to work for them I was driving one of them, I call it #1. It had around 850,000 miles on it. While going down the road and I'd give it more acceleration the motor would start vibrating badly. I'd let off the acceleration and it would quit. Then back on acceleration and it'd be worse. I'd lightly start accelerating and maybe it be smooth.

Motor goes bad on the truck so they put a motor out of the wrecked #4 truck in it. Same issue but then it started having more and worse issues so they put me into the #2 truck.

#2 truck has around 950,000 miles on it and at first everything is fine except it has no power then a few months ago it started doing the same thing with that bad accelerating vibration.

Now I'm in #3 truck with 710,000 miles and it does this the worst.

All 3 rucks and 4 motors will be full of codes and not the first code is more consistent than any others.

Any ideas that I can pass along to our baffled shop mechanics would be appreciated, thanks