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ok, so i have never heard this b4. its a light hiss coming from the dash somewhere. almost sounds like an air brake. the truck is an 01 silverado 2500HD, 6.0l. this happens when cruising, at all speeds. this also happens about every 30 seconds or so. is this normal, what is it, or am i crazy? thanks!:neutral:
 

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sounds like a vacuum hose loose or cracked
 
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