Tech assistance please. Brake booster vacuum line question

[JBsZ06]

I'm sorry to ask yet another question but here goes.

I can't figure out why my car runs well then starts to run as if its "off"

I have narrowed it down to removing the vacuum line to the brake booster and then putting it back on...

All of a sudden when after removing and then returning it to its home the cars running much better...

A lot peppier. As if its alive.

I have no idea why this is having an effect on the part throttle drivability but do I have the option of replacing the little nipple or replacing the brake booster..?

Could either of those be allowing a slight vacuum leak? or a build up of too much vacuum...? I don't know what the hells going on but the action of removing and then putting back on that little nipple is making my car run great!

I hear the noise (like a sucking sound when I remove the nipple) so you would think there isn't a vaccuum leak but still the car runs so much better after I disconnect and then reconnect the nipple..

Could someone take a guess what is happening and what can be done so I permanantly fix this?

I appreciate any hypothisis.



JB

[vettex2]

spray some brakekleen around the connection while running the engine
if its leaking, the rpms will change

[LLC5]

Try pinching off the vaccuum hose with a quality flat long nose vice grip and drive the car, remembering that you have no brake assist. If it runs and idles better, then your brake booster may be leaking.