While driving my car, I hear a hissing sound (like air is going through somewhere) coming from the front of the car.
Jul 11, 2009 at 8:31 AM
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MMPRINCE4000
CAR REPAIR CONTRIBUTOR
8,548 POSTS
If engine idle changes it is most likely a vacuum leak.
Also look at radiator hoses for leaks.
There are a couple vacuum switching valves, one for EVAP system on throttle body, it will usually click but can hiss.
Jul 11, 2009 at 9:28 AM
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