if you havent already i would def check/replace the fuel pump relay,make sure there is no cracking on the vacum line going to the fuel pressure regulator,make sure all the plugs/wires are new also cap and rotor is new,make sure all coil wire connections are tight.and i think you said the ovp was new right? and you replaced the fuel pressure accumulator?are the fule pumps new? you may want to have the fuel pressure checked at both fuel pumps at the check valve,while doing so i would replace both fuel pump check valces.