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high pitched whissel sound at idle
i have a very high pitched whissel sound at idle coming from under the hood, just started the other day but it is getting worse.it goes away as soon as i rev the engine up. its coming from underneath the hood i have tried to listen all over with a stethascope but just cant seem to pin point it. any help would be must appreciated, as it is driving me crazy haha. thx
ps the truck has 4" turbo back exhaust, a egr delete kit and studs.