Throttle body part ID question

Hey folks - 1st post for me.

Can you tell me what the two small “spouts” are on the top of my throttle body? Also, I only have one black cap for them but have seen pictures online where both were capped. What is the function and should they be capped, uncapped? This is for my 01 Tacoma 3.4L.

 

Thanks Taco Critter.

Any idea what line? I can’t seem to find any line that looks like it should go to it.

 

Looking at the vacuum diagrams it looks like they are both capped on a 2001.

 

Both are capped on mine.

 

both capped on my '01:

 

All three are capped on mine.

 

Both capped for me too

 

I've got an 01' 3.4L, also capped on mine. I believe those nipples are for EGR, I think only older 5VZ Tacomas had them.

 

Wow, thanks for all the pics and info everybody. Definitely answered my question. You guys have some pretty clean motors in those pics. I need to step up my game. Thanks again!

 

Both of mine are capped also.