How do you fix lean fuel to two cylinders on ford 5.4 engine?

To fix lean fuel issues on two cylinders of a Ford 5.4 engine, start by checking for vacuum leaks, as they can cause an imbalance in air-fuel mixture. Inspect the fuel injectors for clogs or malfunction, and ensure that the fuel pressure is within specifications. Additionally, examine the intake manifold gasket and any associated sensors, such as the mass airflow sensor (MAF), for faults. If necessary, use diagnostic tools to pinpoint the specific issue and address it accordingly.