This is my problem. Two days ago I started to hear some noise on the drive's side. This only happens when I release the brakes and I step on the gas hard. For the first two seconds or so of acceleration it sound a little like the rattling of a catalitic converter when It is going bad or a grinding noise. I have a Base Auto. I took it to the dealer and they said it might be the intake. I took it out and reinstalled it. That was not the problem. Any Ideas to what this can be. I know it's not the catalitic converter because the noise seems like its coming from around the footrest area. For some reason I think it's my tranny.