I was looking at some parts on the intake manifold and I saw some things in the diagram that I don't recall when removing my manifold.



#2 is listed as "Engine Plug, Qty 2 required"
#10 is listed as "Spacer"
#11 is listed as "Blanking Plug"

Also I don't see the little red piece next to #4 in the diagram which helps "bite" into the hard plastic tube? Is that replaceable?

 

I found the little red part next to #4, its the brake servo vacuum connector: LZN100220L.

 

No clue on on the plugs, but the spacer you'll likely find already attached on the lower intake. There are two I believe

 

#10 is the spacer that goes between the heater core supply feed tube mounting bracket and the upper intake plenum, on the stud.
#2 is I believe is a core plug on the back of the upper plenum?
#11 rubber plug over the vacuum port on the upper plenum near #4?

 

#11 is the plug that goes over the port in the Plenum if you do not have SAI. If you have SAI, then one of the vacuum hoses running from the small vacuum reservoir above the SAI pump goes into that port.