Second noise in my car this one drives me nuts. When I'm parked running at idle or even driving at idle I have a rattling noise in my dash and its driving me nuts. Any ideas what it might be?? A little gas to bring it above idle roughly 1300 RPM it goes away.

 

I have probably about 30,000 dash rattles. But that's probably my fault (poly trans and engine mounts)

Obvious ones:
-Crap in the glove box or crap in the left side cubby. Remove crap or line them with closed cell foam

Some that I have fixed:
- Rattle between the main dash section and the ~6" wide strip up front by the windshield (yep they are 2 pieces). I put in some weather strip style sticky foam between where the main dash piece goes under the other piece.
- Gauge cluster: This one is tough, for me there was a QC error on the bezel where it grips under the gauge cluster. One of the 2 fingers was missing and allowing it to flop around. I glued on some more plastic. That and realigning/tightening it a bit (screws under the "hood" of the cluster and behind the silver trim pieces) seemed to fix it sofar.
- Silver trim pieces: I have popped those off several times and they were getting very floppy, mostly the long one on the passenger side. To fix you need to move the clips onthe back a bit so they are all the way on the plastic fins as far as they can go. I had to take the clips off and rebend the prongs to get them to do this.

I still have more, but they are dwindling. I have noticed steering makes them immediately louder. If on the highway and tracking perfectly straight my rattles dissappear. But once you put a little pressure to turn a bit the ratling comes back. I can almost make a beat with it if I concentrate.

Oops didn't realise you had an LS, in that case I don't think those trim pieces I was talking about are silver on yours.