simply put what does it acutally do and is it necessary? i know it stores vacuum but for what?

 

So the vent positions don't change every time you accelerate for one

 

And helps the cruise control do its thing.

 

i see but does it affect its drivability or performance? idle,acceleration, etc?

 

Unhook the hose and see what it does.

 

the thing is it hasnt been connected since i bought the car. i was planning on hooking it all back up but i wanted to figure out what it was actually for

 

Well hook it back up and see if there is a difference. If the hose was rotted out you would have a vac leak which would cause some problems.

 

Has noting to do with the engine operation.
Is only a reserve container to maintain a constant vac supply when the engine vac changes; like when you accelerate

 

Without it when you nail the gas your HVAC will move to the default (defrost) position and then will return to wherever you set it once you let off the gas again. Not that the lever will move, but that's where the air will blow out during periods of low intake manifold vacuum (like at WOT).

 

thanks every1 for your replies hooked it all back up