engine light comes on
 

When i put my foot down, the car suddenly looses power and the engine light comes. Then to reset i need to pull over, switch off and restart. What is the problem.

sth, from what you are describing, it is sounding like a problem with your throttlebody. The loss of power that you are feeling is a safety feature built into the car when it senses that the engine is potentially in a damaging condition (ie, running really lean or in an overheating condition). The "Check Engine Light" (the light you are seeing) is just another indication that you are experiencing issues. The best advice that I can tell you is to take the car to a local shop/auto parts place and see if they can read the codes for you (the port to obtain the codes is under the dash near the steering column). Once you get those codes (should be something along the lines of PXXXX where XXXX is a series of numbers). Give us all the codes and that will help us get you a correct diagnosis and get the car back to 100%

loss of power
 

On smooth take off and smooth accelleration, i can go up to 120 km with no problem. But as soon as i go harder on the pedal to overtake a vehicle, i suddenly feel the drop in power and the glow plug light comes. then i need to pull over and reset by restarting the engine.Do i need to replace the turbo unit - 2.2 diesel xtype 05