When mazda 6 first started, the speed of stepping on the gas pedal decreased.

Hello, according to your company's description, it should be caused by serious carbon deposition on the accelerator. I suggest you go to the repair shop to check whether the carbon deposit on the accelerator is serious. If the carbon deposit is serious, just clean the throttle. I hope I can help you. Have a nice trip. If you have any questions about the car, you can ask the car mechanic. 4S shop professional technician, 10 minutes to solve.