ive got a d15b in my car like the 1 below. if you look on the throttle body you'll notice there are two pipes coming out of it,a thin 1 for the fuel pressure regulator,and that bigger one that travels down into the block somewhere.. recently this bigger pipe in my car broke at the end where it plugs into the block,space is constricted i cant see exactly what it plugs into,but it plugs into something plastic ,actually the plastic end that the pipe goes into is what broke,,,this was accompained by highly erratic idling becauseof air getting into the throttle body i fixed this by blocking off the end at the throtlle body, when i start the car air escapes out of the plastic thing where the pipe used to go.. W.T.F is the pipe for!!!!!!!!!!!!! how important is it????????????????????? it would be a mission and a half to replace it ,since its in such an obscure position!!