what kind of vehicle? sounds like spark knock. get better quality gas or maybe timing is off depending on year model and engine type. I hope that helps.
oops sorry yeh 02 VW, most likely spark knock, get your gas from a different station or add some fuel booster addetives.
is it your nails on the steering wheel? Keeping the beat to Bruno Mars? see, that's the way to cure it- turn up the jams and don't worry, 'bout a thing!
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