I am having idle trouble with my d15z1, it has good FITV, IACV, and with both holes inside my throttle body covered it still idles high, not close to a sputter and die. PCV seems good, and no cracks etc. I have tighted my TB and checked throttle plate, TPS is good, so that leaves a vacumm leak somewhere? I found a hose under the intake manifold that has a bolt in it... Does anyone know where this should go? And could anyone post pics or a place i can find where all vacumm lines go? Any help, pics, etc. is greatly appreciated... And P.S. I have searched the internet, found sites with diagnosing the problem, although these only help if i know where my lines run. Thanks

 

Anyone able to share knowledge and help me out here?