Hello,right my car ticks over at about 1500rpm and then drops after a few seconds to 1200rpm,diagnostic puts a fault up saying ELD and basicly somone has removed mine and i can't find any wiring for the sensor to be pluged into under the fuse box,why would this be done?

^^^This is what im left with^^^

Also on my list of problems ,there should be a pipe going from the tube above the sensor but there isn't,What's it for?
Sorry pics may be a bit large
UK ALL DAY