Hissing Sound And RPM Drops!
#1
Hissing Sound And RPM Drops!
I noticed my rpm's dropping a little bit on my 2000 Audi A4 when it was idleling. i then popped my hood and noticed this weird hissing sound every 10 to 20 seconds. every time the sound sounds the rpms drop. its even doing this sound when the car is off. the sound kind of sounds like its letting air out or something! any ideas of what it can be??
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