I had a heck of a time with my PRV fuel injection setup and then found out that the new fuel pressure regulator that I had bought from Autozone was bad. I purchased a number of used injectors from a junk yard and cleaned them with an ultrasonic cleaner and found that on a few of them the pintel opened too far and the spray pattern was more of a stream than a cone. I sorted out the best of them, put them in the engine and beleive that they are all fine. Used injectors can be fine, but you want 10 to yield 6 good ones.

-Scott