I went out and bought a BBK AFPR and the instructions say to disconnect the vacum line from it and plug it and adjust the fuel pressure. Well I did that and when I hook the vacum line back up the pressure drops. For instance I set it around 35 with the vacum line disconnected and when I stuck the line back on it drops the needle on my pressure guage down to around 29 - 30. Is that what is suppose to happen or what. Something else I noticed is if I rev it up the pressure goes up initially and then it goes down to around 25 or so and stays there until I let off the throttle cable. I have 24 # injectors. I am not really sure where I should have the pressure set but I am curious about the whole vacum line deal and whats right and wrong.