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Ok I have the most annoying rpm related buzz in the whole world coming from the passenger side of the dash in my ex coupe. I think its either something in the A/C vent or the idle controler on the firewall in the engine bay. My controler rattles if I knock on it like a door. What I need is for someone to knock on there controler and tell my if it rattles. Its right against the firewall on the passenger sideand has a cable and a wire connecter going into it. thanks so much for the help.