871 rough start and idle

[trucklogger2]

So this condition occurred both before de-mandate and after. Owner says it has been running like this for over two years that he’s owned it. Here’s the thing, on start up and after when left both at idle or any rpm in pto mode it runs rough and unsteady. But with foot controlling idle or any rpm it will run normal. It drives good like a normal diesel should now,done by mmaburt.
Valveset has not been done yet and fuel actuators dry. Not to say they aren’t faulty. 17k hrs on engine 300k miles local work.

Any ideas out there why it would act different on different modes? Btw just installed recon ecm.
Thanks for any answers.