Well, the stock map sensor on my car had its vacuum port coming off a nipple on the throttle body. I noticed that particlar vacuum port only has a hairpin hole in it,
compared to the normal vacuum ports. My question is this. I'm running a GM 3 bar map sensor now. Where should i connect the vacuum/boost line to on my intake manifold? Should i use the vacuum port with the hairpin hole in it (like stock)? Or should i use a normal full flow vacuum port???
Thanks

 

You should be fine using either..., but I would probably use one of larger ports coming from your intake manifold.

 

i connected mine to the port where i unplugged my PCV valve