I took the car our for a drive the other day and noticed a really bad vibration towards the rear end of the car. I wil be driving along in any gear doing really any speed and if i tap the gas quickly i feel a horrible vibration and chugging feeling. At first i thought it may be my clutch but i have replaced that before. I ruled that out because if i launch hard and go throught the gears it does not slip one bit. Tires breaking loose and all. Has anyone else experienced this before?