HI there! Forgive my ignorance, but I've just purchased a 2016 Focus Titanium 125 1.0 Ecoboost (Heads up, I've driven for decades but know next to nothing about engines, I'm just copying this technobabble LOL) in November, a former Motorbility car with not much mileage. It's been brilliant...

I had lent my car to my mum and when I got it back I noticed it was slow pulling away from a park position, and when I was driving along and change gears the rpm counter was very high then dropped low and there is a noise like someone revving the engine at full capacity. I don't know if people...