My nissian altima 2.5 has a noise in the dash when I take of from a dead stop . It goes away as your speed increases. It only happens when you accelerate. Any help.

Are you sure it is not the engine mounts? I had a broken engine mount and it would make the funny noise when I'd take off from dead stop. Probably broken engine mount. Not cheap to fix, but you need to get it fixed before your engine gets too out of whack and costs you mucho buckos. There are 4, 2 in the front, 2 in rear of engine. Replace either both front or both rear as they are sold in pairs anyway.