i cant pin point where it is. it sounds like its right by the IACV i think it might be the EGR tube or what ever behing the intake manifold is there a way to find out exactly where it is. i know in high school we had one of those things that has a point on it and it hooks up to your ears. but i dont have one of those. can i just use a piece of tubing mabye? its really bugging me. my car actualy stalled when i put it in reverse. and then it would just bog down in drive. i saw that the IACV tube clamp wasnt on all the way and now it doesnt bog but there is still a very loud noise coming from around that riegon.