The actually exact pump is a DP210 which has a timing retard at high power and a timing advance at light load. From the pump sale lit: " light load advance travel capability to 28� engine maintains misfire margin at part load. The light load injection timing is set on each pump and the speed advance is controlled by a fixed stop at rated speed to provide advance consistency. The advance response rate is optimized to help prevent transient misfire."
I'm guessing the advance/retard mechanism is sticky or bunged up.
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