okay I have put together a nitrous system from some existing parts off a power shot system I had on gas hotrod. I basically wired in a pressure switch(attached to the throttle pedal) to a relay then to my nitrous and purge solenoids.My problem is that when I test the system I can hear the nitrous solenoid click when I first trigger the pressure switch then when I lift off and press it again right away it does not click. I can press my purge button as fast as I want and hear it click every time(they are hooked to the same ground) If I lift off the throttle and wait a couple seconds then *click* but it will only click if I wait the couple seconds. Why isn't the solenoid engaging every time I put power too it? I tested it on the bench with my battery charger and it worked just fine....I remember why I took the nitrous off the hot rod now... I haven't been able to actually run the system because I still have to mount the bottles and run the lines....