5th Gear Member
Join Date: May 2008
Location: San Francisco, CA
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sucking noise you hear is indicative of an intake leak.
look under you hood and check your intake hoses for obvious cracking. In case, you can't see any visible signs, easiest way is to use a can of brake cleaner to aid you in your quest for finding the leak. spray around the intake area - AFM, rubber parts, especially where rubber joins to metal.
while you do that, notice the change in idle while you spray. There will be a marked change in idle the moment the brake cleaner soultion touches the break/crack