I've bought a used B-class manaul 1600cc (2018) with 2000 miles . I'm very happy with the car except one thing and that is sometimes when driving slowly upto a junction or roundabout and you need to accelerate away quickly ( perhaps fast approaching vehicles ) the car will not accelerate off as you would expect. It seems to hesitate to respond to the throttle , even when you panick and kick the throttle a bit more , then suddenly it will respond and surge off ??? I think it does it sometimes as well when travelling at speed but I don't notice this as much as I'm not a particularly fast driver. I've taken it back to the dealers in York but they say there's nothing wrong, it's because it's a 1500cc and get a more powerful engine. This doesn't make sense as I can use the paddle gears if it happens and accelerate perfectly . I think it's dangerous and potentially could cause an accident. Can anyone advise please .c