When I rebuilt the Pajero engine, I checked all bearings, valves, pistons, honed the cylinders, reringed the pistons, regrinded the valve seats and changed all seals. It also got a new timing and accessory belt with waterpump, checked the turbo and the glow plugs.
But, one thing I missed were the injectors. Instead, I just put some system cleaner in the tank. Since the engine had been sitting for a while, the injectors are probably less than perfect. The Pajero starts a bit roughly these days. I planned on checking them before Oppomeet. After checking prices, I just bought 4 new injectors. At 15€ a shot for Bosch units, it’s easier to simply swap them all anyway. When in doubt, replace all.