Hello everybody, i have recently bought a 99 miata. Im learning to drive manual and i was just wondering if some of the things i experience normal or not. first, my car lunges under 2000 rpm's in first and second gear if im just crusing at around 10-15 miles an hour, is this normal? when i start thecar i put it in first gear and i start driving over 2000 rpms the car is fine and i start to change gears accordingly, even if im going under 2000 rpms and chage gears and accelerate, the car is fine, the issue begins when i stay under 2000 rpms forlonger than 4 seconds, then it starts lunging violently, should i worry? second question is, there is a small vibration when i start engaging 1rst or reverse, is this normal also?