I have Nissan Sunny 2009 model with automatic transmission. I am facing a problem with it that sometimes what happens when I put the gear to drive it gives just a shake to the car for 2 seconds. If i press the accelerator the car doesn't accelerate, then I need to turn off the engine & start again. If the same thing is repeated, the car doesn't accelerate again the again, switch off the engine, then again start if there is no shake when i put the gear to drive the car accelerates very well.

Also, if I am going normal & I need to put brake abruptly some times same thing happens that car doesn't accelerate again & runs at speed 20kph, but this problem is not continuous it happens in very rare cases

So please I request you to please guide me what should I do.