yeah i would agree with scott, on a different note i had a old vacuum line go for a s**t on my chevelle quite some time ago and it created the most annoying weird squeeling flutering humming noise , had the dealership mechanics in fits trying to find it then when we did no one could believe it almost like it was coming apart from the inside . if you can try to get a piece of a hose or a stethoscope ,would work better then a screwdriver
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