The vacuum line I use on my 2.2, but with a 2.4 Intake manifold, is the one with green around it that leads from the intake manifold to the back of the engine bay. I think its the brake booster...

 

i used the vacuum line that feed to the middle of the intake..(RED) the WHITE arrow points to where it hooks on to.



close up



DO NOT USE A STRAW USE vacuum line
and i just covered my TB with tape so nothing got in it b/c I didn't seafoam it right away(TAKE IT OFF BEFORE STARTING THE CAR)

 

I like the spray seafoam because it comes with a straw that fits under the vacuum line, so you dont have to leave it disconnected while spraying it.