I removed the cover and didn't see anything out of the ordinary. I also checked the hoses and they don't look dry rotted or cracked. I can't see the underside of the intake manifold, but the top looks fine (no cracks).
I haven't tried the carburetor cleaner trick, but I will soon. I haven't remembered to buy carburetor cleaner. I'm beginning to think this might be normal? Can someone go out to their XA and listen close to the intake manifold? Do you guys hear a sucking noise when you turn off the engine?
I made another video showing how it sounds when I turn it off. You might need to turn your volume up. Is this normal?