What are the causes of engine power loss?

[McIsabel]

Engine power reduction and weakness can be attributed to the following reasons: Carbon buildup issues: This includes carbon deposits in the cylinders, throttle body, spark plugs, and intake system. These components are directly related to the engine's power output. When excessive carbon accumulates inside the engine, it reduces ignition energy and decreases intake efficiency, ultimately leading to reduced engine power and weak idling. Fuel system problems: Using incompatible fuel grades (for example, using 90 octane instead of 93 octane) can cause decreased vehicle output power and reduced performance. Alternatively, blockages in the fuel tank vent, fuel tank switch, fuel filter, or fuel lines between the tank and carburetor may restrict fuel supply, resulting in an overly lean air-fuel mixture and weak engine acceleration.