Which of these is a sign of fuel line blockage affecting injectors?

Uneven engine performance is indeed a significant indicator of fuel line blockage that impacts injectors. When there is a blockage in the fuel line, the flow of fuel to the injectors is disrupted. This can lead to certain injectors receiving insufficient fuel while others may receive a normal supply, causing some cylinders to misfire or run inefficiently. As a result, the engine will not operate smoothly, leading to noticeable irregularities in performance. This could manifest as rough idling, hesitation during acceleration, or a decrease in power output overall.

In contrast, options such as increased speed and clear fuel lines do not align with the symptoms of a blockage. Increased speed is typically a sign of better fuel flow, while clear fuel lines indicate that fuel is moving without obstruction. Fuel leakage on the ground might suggest a different issue altogether, like a broken line or a faulty injector, rather than a blockage affecting the injectors' performance in terms of uneven function.