Hi,
To my knowledge the firing order is 1 6 5 4 3 2.
Perhaps this may be of help for a 2002 GMC Safari Van 2WD 4.3 liter V-6 VIN "W
This was originally posted
here.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.
Good luck and kind regards.
Thank you for using FixYa.
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