Currently in the process of working out all the bugs on my new motor so I can take it for a drive to seat the rings and start breaking everything in, but one problem is really holding me up. I'm getting a low fuel pressure code (P0148) and I've went through 2 brand new sets of plugs due to fuel fouling. I did a data log and at various RPMS it is only reading a steady 25 psi. I have a return fuel system and the mechanical gauge on my regulator is ready a lot more than that when revving. The car is on a base tune currently from a very reputable shop, but very stumbly when revving. I had a cheap ebay frps on the rail and I'm starting to think that was my problem. No fuel smell in the vacuum line but a strong smell of fuel in the oil along with all 8 fuel fouled plugs. I have since replaced all 8 plugs....again (ngk tr6), changed the oil with new break in oil and changed the frps with a motorcraft one. I'm redescent to start it again because I'm sick of going through plugs. would this be a sign of the cheap frps not functioning properly?? Any help is appreciated thank you.