you need to know what size engine you have. 2.3 liter 4 cylinder, 3.0 L 6 cylinder, 8 cylinder etc. However the firing for a 97 is : 1-4-2-5-3-6, which is a 6 cylinder . You can find more on what you need at google .com. Type in your exact year and engine size. Click on firing order and It will give you the information , or click on videos and a youtube video will show you how.