Hey guys, I just bought a used mazda 3 touring 2016 and when I test drove it, its seemed fine and ran like a beauty. But as I was bringing my car home from the dealer and got on the hwy, i realized the car would start trembling/shaking when I'd start accelerating from 100km to 120km. My question is, is this normal for mazdas or is this something I should be worried about? It only happens specifically at that speed and stops once I'm doing 120km steady. Sorry if I posted this in the wrong place just joined this forum.