What is the correct sequence to hookup plug wires on a 34L V-6 engine?

You could do as the last guy suggested, which would be a good idea...BUT...in the case that you pull all these plugs out at on time, here are a few good ways to know what firing order they go in:

1. You can go off of the length of the wires. The wires only reach so far and non of them should be over stretched or dangling.

2. The cylinder's order is [5] [6] <---back of engine

[3] [4]

[1] [2] <---front of engine

3. Cylinder 1 ignition coil is ALWAYS connected to number 4

Cylinder 3 ignition coil is ALWAYS connected to number 6

Cylinder 5 ignition coil is ALWAYS connected to number 2

This is a funky order set up, but that is how it is on the 3.4L V6 engine of my 96 Toyota T100. Hopefully that helps.