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Hey guys, I have recently started to hear a low picth howl or whistle when im applying the gas at a normal pace not gunning it or barely touching it. I notice it mostly after I let off the gas it kind of sounds like a whirring sound, I was thinking a vacum line but I can't find any that look to be in bad shape or dissconected.

I know it might be the IAC but I thought that usually sounds more high pitched. I know its coming from the engine compartment and not the rear end so I have ruled out the rear gears going bad, but I am not sure what else it might be. I dont want to take my IAC off and clean it or replace it if I don't have to so any other ideas would be a great help. Thanks, Jon.
 
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