Why does the car idle shake and have weak acceleration on rainy days?

[VonMartin]

The reasons for the car idling shake and weak acceleration on rainy days are as follows: 1. Severe engine carbon deposits: The gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in an excessively lean mixture during cold starts, making it difficult to start. In this situation, the car will only start easily after the carbon deposits have absorbed enough gasoline to become saturated. After starting, the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the engine's vacuum suction force and burned, making the mixture too rich. The engine's combustible mixture alternates between being too lean and too rich, causing the idle to shake after a cold start. 2. Ignition system failure: Check the working condition of the spark plugs, high-voltage wires, and ignition coils. Poor performance of the ignition system and weak spark plug firing can also lead to such fault symptoms.