vacuum/exhaust leak
Go to shbox.com.He has lots of usefull info.Tells the lenght of each plug wire for each cylinder.Also might be able to identify that tube.Good luck and have fun with those wires.Look to be a pain on passenger side.
Sorry,at shbox.com ,click on the center of page where it saysTech page-component views,how to's-diagrams,etc.then click on reference area.#12 is stock plug wire length.Should put you in the ball park even if you use other brand wires.
shbox.com is for ltx models



