How many of you replace the IACV, TB, and Intake Manifold gaskets whenever you clean your TB, remove your intake manifold, or clean your IACV?

Im trying to spot a vacum leak that causes crazy vibration in drive, it goes away in park or nuetral....i just remember reusing all of those gaskets when i did all of those things that i listed... would this most likely be where my leak is coming from?

 

i change all of them exept the iacv and it isnt leaking at all so ya. but i prolyl should replace it . never thought about it i dont even rember seing a gasket i just wasnt paying attention i guess.

 

yea, im just tyring to figure out what the hell is causing my vibrations in drive (idle, while stopped) I hear the hissing but i cant spot it....

 

hm cahnge all the gaskets. i would cause once it get compressed its pretty much usless if you take it off and try to put it back on.