Question about 2008 Pontiac Grand Prix
If the sound is from the rear of the vehicle then it may be that the baffle plates in the fuel tank are broken away and allowing full movement of the fuel rather than a controlled movement.
Posted on Nov 22, 2014
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Posted on Jan 02, 2017
It sounds like you are having an issue with the fly-by-wire. Isn't this car still under warranty? It could be a bad rheostat in the pedal or a bad throttle positioning servo at the engine.
Posted on Mar 05, 2010
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