2009 volvo D13 Jerking

Who is doing the work? Did they check the injectors?

Throwing parts at it only makes you poor.

 

It's injectors don't mess with timing gears but have dealer do injectors they are known to go bad so it's worth having the warranty on them

 

I think much wiser to find competent mechanic that knows how to fix.

Throwing parts at the truck without proper diagnosis costs you allot of $$$$ and wasted time....

 

Original fuel lines from tanks to motor ??

 

With that many miles, fuel lines are a maint item. They're not expensive to replace either..

Sucking air bubbles while the engine is under a load is a common problem with old fuel lines....

 

I know you said its not a sensor but I would replace both the oil pressure and crankcase sensors they can cause problems.