Any vacuum leak that big should set off a "lean" code. Are there any codes present?
My gut feeling is that it's probably a loose fuel purge line connection. It's by far the biggest vacuum line and could conceivably cause the symptoms you're seeing. That's the big hose barb immediately behind the throttle body. Check to make sure it isn't loose or cracked.
Check all of the rubber boots and hard lines for the SAI vacuum system as well. They tend to go. They're all tied together so tracing them should be easy.
My gut feeling is that it's probably a loose fuel purge line connection. It's by far the biggest vacuum line and could conceivably cause the symptoms you're seeing. That's the big hose barb immediately behind the throttle body. Check to make sure it isn't loose or cracked.
Check all of the rubber boots and hard lines for the SAI vacuum system as well. They tend to go. They're all tied together so tracing them should be easy.
