What size engine?
the firing order is 165432
The firing order is 1-6-5-4-3-2. The number 1 plug is the closest to the front of the vehicle, From therer you work clock-wise 6,5,4,3,2.
165432 is the firing order for the 4.3 L engine
fireing order for 1997 astro van v6
165432
Chevrolet Astro Van 2WD4.3 liter V-6
1.6.5.4.3.2
On my Astro, the firing order is located on the distributor cap- Where each plug wire goes into the cap, there is a number on the cap-find#1 go clockwise for the next number etc. That's your firing order
18436572 clock wise
Click the link.
165432 #1 cylinder is left front
18436572 clock wise