I own a 99 CL 3.0. I’ve owned the car for about 6-7 months now and I can tell this car has been really well maintained and even since I bought the car I’ve done a cv shaft a rack and pinon replacement. I’ve been having this rattling going on for a while not I thought it was suspension but last night I found out it’s not. I was looking at the engine last night and after it gets to operating temp if I slightly rev the engine I’m talking like 1.5 to 1.8 rpm’s I’m getting a rattle like a marble in a tin can. It doesn’t do it at any other speeds or revs just at very low rpm. I’m new here and maybe this has been discussed. Anyone have a idea what it could be?