AIR PROBLEMS

WELL I FINALLY GOT MY FRONT CYLINDERS IN AND I HAVE TO WAIT FOR LIKE 10 MINUTES TO GET ENOUGH PRESSURE TO GET IT TO NUGE UP.I HAVE TWO 380 VIAIR COMP. AND ONE 5 GALLON AIR TANK. I HAVE FRONT AND BACK 4 PARKER 1/2 VALVES.MY FRONT GOES UP AND THAN STARTS TO DROP.WHAT THE HELL IS GOING ON? AND WHEN I HIT THE SWITCH TO GO UP THE DUMP VALVES OPENS UP,BUT JUST REALLY QUICKLY.I OPENS AND THAN SHUTS.I DONT KNNOW WHAT THE FUCK?ANY SUGGESTIONS OR IDEAS?