how do I repair injection fault on my renalt scinice 2?

My car started, to take longer to start and then it stopet to start, the starter motot turns the motor fast,but does not start,but if I tow the car it starts and has power until 3rd gear, then it gives me injection fault and looses power, as if it goes into limp mode pls help I have spent a lot and my pocket is empty, I am a mac , if some one can help I get to work late , and can loos my job regards clinton 'sorry for spelling. Renalt scinice 2 2005 19dci