Engine run-on (dieseling in the wrong direction)

I have the vehicle listed above B Utility model with 170000 kms on the clock. It has a multipoint fuel injection system, the engine is basically a inline 4 cylinder (1398cc) SOHC, with a compression ratio of 10:1, 8 valves, 2 per cylinder, which produces 65kw at 6,400 RPMs, it has 6 sensors with simple functions and obvious solutions and these sensors, each have different ways of showing a fault with that specific sensor. The sensors are:

1. Crank Angle Sensor
2. Mass Airflow Sensor
3. Temperature sensor
4. Map Sensor.
5. Idle Control Valve
6. Throttle Position Sensor

It has a vacuum controlled fuel pressure regulator valve so the engine is really basic and easy to find a fault and see to the fault.

I am a diesel mechanic and can't seem to get my head folded around the problem I am having. So I am asking fellow mechanics to help me diagnose the problem as I know these engines quite well, the problem is the engine has a run-on ("dieseling") problem after running hot or even cold. What I find strange is that this phenomenon happens very seldom but it happens and it bothers me, is that is when this happens, the engine diesels in the wrong darn direction, it diesels in counter rotation! So the engine have never been opened nor overheated in any way. Does not consume oil. Does not consume water neither does it have a drinking problem to the consumption related to the performance and the economy nor does it have power related problems, no smell of fuel before or after running, after this happens the restart procedure takes a few seconds to restart. So please I need Help urgently! If there is anything I have missed to mention please feel free to ask me for more technicalities and information regarding the engine specifications. Engine code is C14SE.