WARNING: This page is about a different car, the 2007 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Firing Order/Cable Routing - 5.7L
Courtesy of CHRYSLER LLC
These numbers (2) and (3) can also be found on the top of the intake manifold (1) to the right of the throttle body.