a few issues with my citroen synergie diesel hdi 2.0?

I have a citroen synergie 2.0 hdi w reg! The engine management light comes on intermittently! And there is a slight diesel leak near the injectors (have tried to clean it up and see where the leak is coming from but to be honest 3 of the 4 injectors have wet diesel on them! a friend plugged the diagnostic machine thing in and said it came up with a low pressure fault (although personally I wouldnt take this as gospel) Could the low pressure be caused by this small leak? Plus when first started and idle the car revs funny! Its like juddery! but this goes after its revved a bit! has anybody got any ideas of how i can find the leak without taking the car to pieces (i just know it wont all go back) could the leak be the cause of the other problems?
thank you in advance for taking the time to read and reply