i put a fuel pressure regulator on it and tweaked it ever so slightly bit at a time until it wouldnt go at all each way

the fuel rail may be a possibility thank you thank you for all your comments all help appreciated

how do you suggest i fix this? could i take put anything in the fuel to flush out the injectors or injector rail if they are maybe clogged with dirt or should i remove them and replace or can they be cleaned?
and how do you suggest i do this?