Mr Willks is correct, you need the diagnostic software & cable ( not hard to find if you know where to look or who to ask
) In addition you need the co-efficients for the injector that you are replacing, these are specific to each individual injector. Afaik the only way to get the co-efficients is to download them from dealerport which is only available to authorised dealers. I believe that you can strip & clean the injectors, but I've never done it personally.
ee lad, tha can't educate pork