95 Riviera bottom side engine knock

I have a 95 SC Riviera, engine chugging when a load is put on it. Went on a trip to WI issued worsened. Got back let car sit for 2 days then bottom side engine knock near crank any ideas? :confused:

Oil pressure ok, oil clean and full? There is no way to give you an accurate diagnosis here. If the op is low and /or you are sure the noise is crank related, pull the pan and look, are there any traces or metal in the oil?