looking for some help

have my dad's car when the car is idling there is a sound like a vacume leak but when tested with propaine no leak shows car runs normaily no codes are set but you can hear a loud vacume sound by the intake any thought would help??

FIX posted 1/12/2004

iATN Members:
Login to view full TechHelp request
Auto Repair Pros:
Join iATN to read this TechHelp request
Vehicle Owners:
Find a nearby iATN member to repair your vehicle