[Daggs]

I have this problem with the motor runs fine been checked over by a auto electrician test all good.problem is idles ok drives ok upto 60 kls then when you take it over that it starts jurking around then goes into limp mode you can back off an it gets a bit smoother and if you stab it some times it will pick up for a little bit but then starts jerking around.if you knock in into neutral shut it down then start it again it will start and do it all over again.we did oil pressure test on it idle at around 30 to 40 psi then when you bring it up to load its around 80psi goes into limp mode again any thoughts on what it can be.

 

[DieselDrax]

No check-engine light? Hard to say, most things that would cause that behavior would also trigger the CEL and log DTCs. When was the last time the fuel filters were changed?

 

[AlabamaDieselMan]

Could you possibly record it happening? That would help tremendously with diagnosing it, like Drax said it sounds like a fuel issue, but it could (less likely) be a MAF sensor issue.