Brad, I'd get an external oil pressure test gauge onto your engine before you run it any more. Unscrew the oil pressure sender unit from the engine block and fit the test gauge to the block. That "hard knock" could just be a faulty injector on one cylinder, but just to make sure the bottom end of the engine is not the source of the "knock", check that oil pressure. Chances could be that the oil pressure light on the dash is not working. It should light up when the key is turned to the "on" position, along with the alternator and transmission oil pressure light. let us know what the outcome is from here, Evan.
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