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320 BL bogging

My 320 is pulling engine down when using two hydraulics at same time did a pvr calibrate and installed new pvr soliniod checked pvr psi adjusted to spec. dosnt seem like the low side makes a diffrence when trying new setting on the service mode could it have somthing to do with main releif valve as i can tell it has been touched paint is missing line releif valves still have the paint on them it is a 1997 model.Thanks PS it will pull it down from 2100 to bout 1600 rpms.