Q: Truck dying and oil pressure dropping to 0

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When running the oil pressure goes up and down to 0 and when I'm slowing down or coming to a stop the Rpms drop and oil pressure drops and I die just wondering what else I can check I had it scanned and the mass airflow sensor and knock sensor was throwing codes I've replaced the oil pump air filter and mass air flow sensor and oil pressure sensor and oil and filter even tried stp oil treatment and nothing has worked or improved the only thing I didn't change is the knock sensors could they make me Loose pressure and acceleration and die

My car has 206000 miles.
My car has an automatic transmission.

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