This is where the idle control unit is located. I don't know if I was suppose to take this off. I suggest you try to leave this on while you take off your intake manifold. I think I damaged mine. Ever since I put it back on. My idle has been rough. I was told this has a memory input in it which the battery can't go dead. So if anyone has any suggestions to fix this please let me know. The error code is : p2119