the big screw is for idle. there is a small screw under the cap at the top of the reg. you have to drill a small hole about.125" below the top of the extrusion. use a small pick or allen wrench to pop the plug out. turn the screw in till it stops and turn it out about 2.5 turns. try to start. turn.5" at a time and continue to try starting engine until it starts and idles. then try to adjust it and the big screw till it runs good. once its idling you can try disconnecting the hose on the bottom of the side with 4 screws. if performance improves you can plug the end of the hose and leave it off....do not block it and put it back on the reg...if you want to fix it right let us know. it requires another much larger plug to be removed. 7 pounds is too much. the pressure needs to be 5 or below. put the guage back on and accelerate the truck (simulate loaded condition by using hydraulics) if the pressure drops rebuild again if not we're back to the hose.