To find the correct firing order for your specific truck, you need to:
1. Find your engine's identification number (VIN). This is usually found on the dashboard on the driver's side, or on a plate in the engine compartment.
2. Use the VIN to identify the exact engine model. You can do this using online resources or by contacting a dealership.
3. Once you know the engine model, search online for the firing order. Many automotive websites and repair manuals will have this information. You can search using terms like "[Engine Model] firing order."
Without knowing the specific make, model, and year of your truck, it's impossible to provide the correct firing order.