Hi sir,my car has a problem that when i change car speed suddenly,i feel my car is stop very shot and draw back immediately.It's happen frequently.Please help me what should i do? I already changed engine oil,auto gear oil,engine oil filter and spark plugs.But the problem still remain.I am from myanmar so i can't send denoation amount.Very sorry for about that.As my english skill is not good enough,i apologized for busy to u.