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If you have a biased ICP sensor that's telling the PCM that the HP oil pressure is higher than ~500 psi at idle, even though the pressure is actually lower, the PCM will send a signal to the IPR to bleed off some pressure. If it gets low enough, the engine won't run right because the spray pattern will be too coarse and won't burn right.
And yes, abnormally low HP oil pressure will make the engine quieter.
Try pulling the ICP connector and see if it acts closer to what you had before. Disconnecting the ICP makes the PCM use default values to control the HP oil pressure. If it runs better, your ICP sensor is suspect.
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First truck -- 1929 Model A Ford pickup, restored from ground up. Wish I still had it!
99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version  ), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.
Hard or no-start? Check Here
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