What causes engine shaking when a car passes through water without stalling?

[VanBeau]

The reasons why a car passes through water without stalling but the engine shakes are as follows: 1. Engine intake pipe leak: The intake system has many intake manifolds or various valves. Any leaks can allow unwanted gases to enter, causing the concentration of the mixed gas in the intake manifold to be too high or too low, ultimately leading to intermittent engine shaking or weak symptoms at idle. 2. Fuel system blockage or failure: Due to a blocked fuel tank vent hole, fuel tank switch, fuel filter, or partial blockage of the fuel pipe between the fuel tank and the carburetor, the car cannot receive the corresponding amount of fuel at idle, causing the mixture to become lean, the engine's power output to weaken, and idle shaking.