GMC Repair: 2000 gmc 4.8rattle, vacuum line, mechanical work

Question
when going the speed limit and letting off the gas peddle, a humm is coming from below.   And also at a stop, give it gas and a vibrate noise, from under the hood..
thanks

Answer
What mechanical work or ANY kind of work has been performed on the vehicle recently ?. As most problems that occur after a recent repair was made can be traced back to the area of where the repair was made as a vacuum line may have been knocked loose or a wire connection came loose, Look around in the area where work was performed.

Without having access to the vehicle these noises could be numerous things. You will need to have someone physically inspect the vehicle.


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