Ok, now I know disecting a noise that I'm not 100% sure what its coming from is difficult through just words, but I figured I'd give it a shot in case anyone else has ever had something happen like this.

Starting within the last 2 months or so my car makes a rattling noise when I start it. Seemed to start when it got hella cold here in New England. It sounds like its coming from right in my dash, like a foot below and behind my cupholders. ( I have a 98 EX coupe) When I rev the engine tho, the noise temporarily stops, then when I let the rpms drop it starts again. Once the car warms up it doesnt make the noise at idle, but when I start in first gear if I dont give it enough gas and the car "chugs" it makes the noise too. So something is obviously loose, and it is worse when its cold out.

Could it be a heat shield?? I really have no ideas...
Over Thanksgiving break I jacked the car up and checked my catback to make sure it wasnt that and checked the shields around the cat and those were fine so I dont know.

Figured I'd consult the board before I go disecting my dash to get to the problem

Edit: I'll try to take a short video with sound on my camera soon too.