What causes the Nissan Cedric A33 to have poor acceleration?

[SanGenesis]

Nissan Cedric A33's poor acceleration is primarily due to excessive carbon buildup in the throttle body, among other issues. Below are the specific causes: Engine carbon deposits: When there is excessive carbon buildup inside the engine, the gasoline sprayed by the cold start injector can be largely absorbed by the carbon deposits, resulting in an overly lean air-fuel mixture during cold starts and making it difficult to start. Ignition system: Issues with the ignition system. Check the 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 the spark plugs for excessive carbon buildup and replace them if necessary. Unstable fuel pressure: Abnormal fuel pump supply pressure or incorrect readings and poor performance of the intake pressure sensor can cause engine shaking. Check the fuel pressure and replace components if needed.