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It is possible that one or more injectors are not atomizing well. This could be due to fuel pressure out of spec, or blockage inside the injector.
If the fuel pressure regulator is borked, the fuel pressure could be bad. Too much pressure will usually mean too much fuel (the injector opens an orifice, the pressure pushes fuel out through that orifice). Too low a pressure will mean too little fuel, or possibly fuel that does not atomize well, and just dribbles instead of spraying.
Do you have access to a gauge that can check the pressure? Do you have a spec for the pressure? Most of the time, the pressure is referenced to manifold pressure, so the fuel rail pressure would be 3 bar (or whatever measurement) above manifold pressure. There would be a vacuum line from the manifold to the FPR in that case.
I'm not sure how you'd test the injectors for flow and/or pattern except by building up a test rig with pressurized fuel and a battery (3V? 9V?) to open the injector...
-soD
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