Unless otherwise specified on the underhood decal, all 1995 Light Duty trucks with a 5.0L used the 1-3-7-2-6-5-4-8 firing order.
Originally Posted by coryrhonda
you also have to watch the plug wire routing on 7 and 8. they can not run side by side or the could induse a spark and cause predetionation and wost case break a piston. We have seen this at my shop. there are tsb's for this
This is an excellent point, but it applies more to the older firing order (1-5-4-2-6-3-7-8). With the current firing order, you need to keep the wires going to cylinders 6 & 5 completely separated. Any time you have sequentially fired cylinders next to each other on the same bank, you risk creating a missfire if the wires contact each other.