A friend has a 2006 Nissan UD 2600 turbo diesel  with over 400k miles.  Last month the truck had no top end power and would stall at every stop when fully warmed up.  He brought it into the local shop where they found 2 injectors bad.  After replacing all the injectors the engine ran fine for about a week.  Now after a run down the freeway when stopping the idle will oscillate between 700-400 RPM then die and can be restarted immediatly.  

 

Any one have experience with this?  

   

Valve lash. I would check and see if the valve lash is within specs. Might be few valves too tight.