2007 Mitsubishi L200 Engine miss

There is an engine miss. It doesn't come often. When accelerator paddle is pushed, the engine revolution drops suddenly and then comes back with a jerk. When connected to the diagnosis box, no fault is shown in the computer. The diesel filter is only used for little over 5000 km. 100000 km maintenance done about a year ago. Pls advice what could be causing this fault.