To find the firing order, you need to:
1. Identify your engine: Look for an engine ID tag, usually located on the engine itself or in the engine compartment. It will specify the engine's displacement (e.g., 318 cubic inches, 360 cubic inches, etc.).
2. Use a repair manual or online resource: Once you know the engine type and size, search online (e.g., using Google or a dedicated automotive repair site) for "[Your Engine Size] Dodge Ram van firing order". A repair manual specific to your year and model van is the best source.
Without knowing the engine, I cannot provide the firing order.