Is it just 1-2-3-4-5-6?
I think I found the answer to my own question.
Firing order: 1 - 2 - 3 - 4 - 5 - 6
This also may be helpful:
http://wiki.answers.com/Q/What_is_the_firing_order_for_a_1999_Pontiac_Grand_Am_3.4L
This page explains it
http://autorepair.about.com/library/firing_orders/bl-fo-1871.htm
Bill