the problem with after market fuel pressure regulators is that they don’t hold pressure after the fuel pump shuts off. If you have a stock fuel pump or even a walbro 255 lhp pump it might take a bit longer to build pressure.
This regulator I found will help on that because it uses stock fpr
http://www.radiumauto.com/Fuel-Pressure-Regulator-P229.aspxJust thought I would post good fpr