What's the matter with engine abnormality?

[SanDakota]

The causes of engine abnormality are as follows: 1. The engine cannot start: specific reasons include washing the engine, causing water ingress and dampness in the distributor, ignition module, spark plugs, high-voltage wires, etc. Damaged spark plugs. Insufficient battery voltage. The inertia switch is disconnected. 2. The engine stalls when shifting gears: specific reasons include too low idle speed, the idle cut-off valve is not tightened, the gear is too high, and the oil-gas separator is severely blocked. 3. The steering wheel shakes at speed. Specific reasons include the tires not being dynamically balanced after disassembly and assembly. The balance weights on the wheel hubs fall off. There are mud blocks on the wheels. The wheel hubs are deformed due to impact.