Varrying oil pressure

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AvroAero

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Toronto, Ontario
My 99 4.6 seems to be having slight varying in oil pressure about 30-40% of the time. Although it's minor I want to catch it before running my engine dry. It seems to do it under low throttle after warming up, sometimes on the highway. I'm thinking the pump is just going. Although twice before, only during a stop has it made a noise that sounded like a pump running (like washer pump) and didn't go away for a few moments. Maybe a line is plugged? help appreciated.
 
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