It has a new transfer pump,ops,glowplugs.when it stalls it starts back up but hard

If you have not done it you may wont to change the fuel filter , Your fuel pump may be weak and not pumping the right amount of fuel to keep the engine running, by the way if it is running and dying like you say it is you probility have air in the system and need to bleed the system out .

l would check the filter but also if you havent changed the fuel pump relay on the passenger side firewall you might want to do that too.