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Going Nuts

jcupp

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jcupp New Member

jcupp

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2004 gmc sierra, is there anything behind the dash (driver's side) vacuum controlled? loud hiss at partial throttle, no leaking hoses in engine compartment, booster test ok. sounds higher than the booster anyway. Dealership of course say's they can't hear it. Sounds like a purge at shifts, and is definantly throttle position sensitive. Any idea's?

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