My 97 Chevy 1500 is knocking bad it lost all oil pressure so I changed the pump once done it held pressure but still knocked until I started driving then it lost all pressure again I changed pressure
Switch and changed nothing it still holds Prrssure when it first
starts but looses when driving no smoke from the exhaust and I
see no sign of oil and water mixing is there anything else could
be wrong 5.7 liter 350 vortec