I had that same problem a while back. When I would stomp it the oil pressure would drop down near 45psi around 5500-6000 rpm. It would also shoot my dipstick out. I pulled everything apart and it turned out that the clearances in the oil pump were off, basically the oil pump gears inside were worn and I guess had worn down. I changed the oil pump, slapped everything together and now anything above 3500 rpm I get 65 psi. I also use a PH25 fram filter. Hope this might help. Good luck!
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