S13 rb25 wont fire up HELP

[Cynxe]

Just got my wiring specialties harness today for my rb25, and got everything all plugged in, i have fuel and spark and definitely good compression. I have an aftermarket adjustable regulator but its ebay, it reads 15psi and 20psi and sometimes itll spike 30psi, and wont adjust no matter what i change. I pulled off the cas and turned it and the injectors all fired, i turned it a whole lot. Went and turned it over and it fired up for a second then died. Im confused, ive been working on this forever and this is my only issue. Please help

[PapaSmurf2k3]

Either you aren't getting enough fuel due to the fuel pressure being way too low, or your timing is off (could be ignition and/or valve).
Get a fuel pressure regulator that works, verify valve timing, and get the car running to verify your ignition timing.