I read a post which mentioned it is 90% of the reason Maf sensors go bad, so when I bought a new maf sensor I also bought a new valve. Changing the maf was easy, but how do I remove the old valve. It is easy to take of the hose on top of it, but it is screwed into something. My guess is that I need a special tool to unscrew valve. Does anyone know for sure what I need to remove old air injector bypass valve? Thanx in advance fer da help.