What causes lean running condition 5.3?

A lean running condition 5.3 typically indicates that the air-fuel mixture in the engine is too lean, meaning there is too much air and not enough fuel. This can be caused by issues such as a vacuum leak, malfunctioning fuel injectors, a clogged fuel filter, or a faulty mass air flow (MAF) sensor. Additionally, problems with the engine's computer or tuning can also contribute to this condition. Addressing these underlying issues is essential to restore optimal engine performance.