Firing Order

I am working on a 2003 Rendezvous and no one can seem to come up with the correct firing order. My local Autozone and car dealership both gave me different orders, but same cylinder numbers. Which of course ends up with the same wires to the same cylinders. I have also found a firing order online which is the same as I've been told but it doesn't work at all. Now the one I found online has a diagram of the cylinders and the coil packs but it shows the coil packs being at the front of the engine. The one that I'm working on the packs are at the back. Can anyone help???:confused:

If you have the owners manual the info is probably in there. Also, how did you get to the rear plugs?