k this is quie the question and i will explane it as best i can. when looking at my car from the front (90 5.0 lx) the engine is out right now when u look down to the passanger side the is a black plastic box under where the cold air intake would be there looks to be a couple like vacum line from it and a couple electrical conections what is this box and what is it for and do i need it?? and help would be greatly apprectated