Do you have a firing order diagram for a Chevy s-10 1998?

You fail to mention which engine. The 4.3 L V6 is here: http://autorepair.about.com/library/firing_orders/bl-fo-4490.htm The 2.2 L 4 cylinder is here: http://autorepair.about.com/library/firing_orders/bl-fo-4488.htm