That one turned out to be a bad pump, either a camplate or head/rotor issue or maybe delivery valve, I was figuring. Never got to find out because that IP self-destructed pretty soon after. Motor was smooth after pump was changed. However, that's not the only possible cause...
Have you checked valve clearances?
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86 745 D24T/ZF 345k lifted 2.5"
83 764 D24T/M46 155k
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