Verified answer

The stock wires are numbered! You did not mention if it was an SS or not? Everyone has an answer but no one seems to know the application! This vehicle was equipped with one of the 3 available engines 3.5L (3500) V-6, or the 3.9L (3900) V-6 (LS, LT, LTZ) trim levels and the SS trim is equipped with the 5.3L AFM (active fuel management) V-8!

Order for the 3.5L and 3.9L= http://i1127.photobucket.com/albums/l629/mastec197...

Plug Wire Diagram

firing order 1 6 5 4 3 2.

Standing in front of car. Left to right back side 1 3 5 front side 2 4 6 Firing order is 123456 for 3.1L and 3.4L. For 3800 engine 135 front 246 back. firing order 1 6 5 4 3 2.

A service manual is your best bet here. You can get one at any auto parts store. This will have the firing order diagram that you need and tell you all kinds of usefull information. There is also ALLDATA(online service manual). A service manual will have pictures, diagrams and how to's.

Call Auto Zone they will give you a read out of the firing order. Or just stop in and they will print it out for you.