What causes cyl 4 to misfire on 98 Windstar?

A misfire in cylinder 4 of a 1998 Ford Windstar can be caused by several factors, including faulty spark plugs or ignition coils, which can lead to insufficient spark. Additionally, issues such as fuel injector failure, vacuum leaks, or low compression in the cylinder can contribute to the problem. It's also worth checking the engine's wiring and connectors for any damage or corrosion. Diagnosing the specific cause may require a thorough inspection and diagnostic testing.