Problem with Corolla E9…

Hey everybody… since Febuar I’ve been driving a Corolla E9. The car had 120,000km down in February. So far it’s really good and doesn’t cause any big problems. Except for 2 things… While giving gas and “going off the gas” he often jerks. If I let the car roll because I roll to the traffic light or something else and then give gas again, he jerks so 2-3 times and then it goes. Exactly the same is when I walk off the gas. Can anyone of you tell me what this is all about? could or what has to be done? This jerking can be really annoying… Besides, I’m always very upset about the consumption… It’s not normal that a 1.6L engine takes 10l/100km with every way of driving and no matter if highway or city traffic… There must be something done, right? Wouldn’t I be happy if someone could help me. Lg, David