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Welcome and thank you for allowing me to assist you! I have seen a couple of things cause this : 1. a plugged oil pick up strainer, and 2, a stuck oil pressure relief valve in the oil pump. I recommend removing the oil pan and inspecting/cleaning the oil pickup screen. make sure also that the tube is not loose. If this appears ok, then suspect a sticking oil pressure relief valve and replace the oil; pump.
I hope this information helps and let me know if you need further assistance with this.