Im not sure if this is normal or if just a little is normal but; I have a 2002 A4 1.8t Quattro, and every time i stomp on the accelerator (only while moving) it jerks really hard like i got rearended. But its not the transmission slipping the rpm's dont spike when it happens. Is my drive shaft for the rear wheels loosening or the motor mounts crumbling? i have never had an awd vehicle so i have no clue. please any help is appreciated.