Heard this small inlet making noise today while wrenching under the hood on my TB. It is near the air resonator, circled in red on the photo. While the engine is running, you can hear quite loudly air hissing into it. If i plug it with my thumb, the engine dies. What is this inlet for? Is there supposed to be a hose or something attached? I had the air resonator off today, did I accidentally unhook something?