I have a weird clicking/rattle noise when I give the car gas. It goes away after I get to about 2,000 rpms or so. If I apply gas very lightly I don't hear it, if I give it a good stepping then you can hear it. I can't pinpoint the location either. I figured it might be my oil, so I went and got it changed and it went away. Then today its back again. I saw another thread with a similar clicking, but it seemed like that was a constant clicking noise and it got louder with the RPMs, but mine goes away. I'm going to go take a video/sound clip and post that, see if anyone can tell me wtf it is.

 

Valve tap?

 

i have the same problem, but mine is coming from beneath the car..i think mine is realted to my exhaust somehow b/c it started the day i put my y-pipe on, but thats on really tite