need help with testing adjustable bbk fpr

[james87gt]

ok iv had this really bad lag, bog, hesitation at lower rpms so i am checking the fuel pressure regulator i pump the regulator up but the vacuum just bleeds right out but if you have the car running and you pull the vacuum line off to set the wot pressure it will rise so im lost do you think the regulate is shot or is that the way adjustable reg's work the car also doesn't hold feul pressure in the system after the engine is turned off