If you don't have enough mechanical knowledge, it'll be better to take your car to an expert auto service center to fix the acceleration problems. A professional auto service center will have skilled mechanics and equipment to inspect and fix your vehicle's acceleration issues. The cost of the repair won't be too much. However, if the repair is a bit expensive, don't hesitate to pay because your safety depends on it. I'm pretty sure you want to ensure you can get the right speed every time you slow down or speed up.