2010, 5.3L Silverado 4x4 ~26,000miles hey guys, the reason I am asking is becuase when driving, especially pulling, I can hear what reminds me of a vaccum leak or very faint exhaust leak. I have had this pesky sounds for about 10,000 miles now. I have looked at the exhaust manifold and connections in the exhaust. I see no signs of leaking. Yet the noise still persists. Lookin for anyone with similar issues or problems that might have a suggestion. PS: Could be noise from enigne in general. I have check rubber boots in firewall, but that doesn't mean i am missing something. Please let me know if you can help!