1-8-4-3-6-5-7-2 is the firing order, I tried to answer your question but it was locked by someone else.
You could have mixed up the order of the spark plug cables causing the firing order to be wrong. What is the exact year, make, model, and engine size of your truck?
SOURCE: spark plug wiring diagram
3.9L V6 Engine. Engine Firing Order: 1-6-5-4-3-2. Distributor Rotation: Clockwise.............did i guess the right motor? let me know/rate me
SOURCE: 95 mercury grand marquis firing order of spark plug wires
go this page for firing order, u have 4.6 L V8
http://www.moddedmustangs.com/reference/firing-orders.php
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SOURCE: i changed the spark plug wire and the distributor
Recheck the order, 18436572 clockwise. number 1 should be the one closest to the coil tower.
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