What are the reasons for the sluggish acceleration and dullness in the new Focus?

[MacJocelyn]

The reasons for the sluggish acceleration and dullness in the new Focus are as follows: 1. Carbon deposits inside the engine: When there is excessive carbon buildup inside the engine, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture and causing sluggish acceleration. 2. Ignition system: Issues with the ignition system. Check the working condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system or inadequate spark plug firing can also lead to such symptoms. Inspect whether the spark plugs have excessive carbon deposits and replace them if necessary. 3. Unstable fuel pressure: Abnormal fuel supply pressure from the fuel pump or incorrect readings and poor performance of the intake pressure sensor can cause body vibration and sluggish acceleration. Check the fuel pressure and replace components if necessary.