Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.
Here is a diagram of the firing order for the 3.5, let me know if that's all you needed.
Images available only to Customers.
Fig. 5: 3.5L DOHC engine: Firing order: 1-2-3-4-5-6: Distributor rotation: Distributorless
Remember you DO NOT have to accept until you are 100% satisfied with the answer, but, *WE DON'T GET PAID* unless you hit *ACCEPT*