i moved some vacuum lines and I wanted to know which nipple on the throttle body is the correct one to put the vacuum line on, i thought it was the bottom one but it didnt start that way. Yes I can put it on the stand alone nipple on the intake manifold and it will start just fine, but i wanted to put it back on the one i had it before and stupid me i forgot to mark them. I suppose I could do process of elimination but i would rather not

i have a turbo 2 model

 

on the front of the UIM the top or bottom port is the best location for the source.