OK, im driving today back from class and I feel this slight vibration by the gas and brake pedal whenever im deccelerating(sp?). If I put my foot back on the gas, it goes away. Same way for braking quickly. I turn my music down and I can here this loud pulsating sound coming from the front of my car. I thought i had a flat tire but it turns out i dont. Does this sound like the symptoms of a lump in the tire or something?