If you cannot trace it down to one cyl, think timing. I have had many guys bring in injection nozzles to be checked when it sounded like one cyl was miss firing when actually it was late timing scattering the miss all over the place. Just realize that a miss on one cyl will sound just like a fouled spark plug on a gas engine. That pump , according to the parts manual, has an automatic advance , same as almost all roosa master inj pumps. If that is not advancing you will have exactly the problem you are experiencing. Miss at higher speed, runs fine at idle and load. Simple window to install on pump and observe advance while running. Timing lights don't work well with roosa master pumps as it being a inlet metered pump it has constant end of injection but beginning of injection varies according to speed and load due to more fuel at higher speed and also more fuel at higher load so injection keeps getting earlier. Also, that is an energy cell combustion chamber, so the cell on the opposite side of the injection nozzle is critical also. If you do trace it to one cyl, compression or energy cell is most likely problem but I think it would miss at idle also if compression or cell.
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