you can take your injectors to a reputable shop that works on diesel. They can clean the end and check the QUALITY fo the spraying when it opens. If that's okay, you're almost there. Each good spraying nozzle will open at a different pressure, but if some are too high or low they can be opened up and have a different shim installed behind the spring. This may sound complicated but it is NOT. Like I said, I had 10 injectors tested, and a good group of injectors cleaned and identified for $40....and I live in CT, where things tend to be expensive , but I got lucky this time