Firing Order for 1998 4.2
The Coil-pack is numbered. Cylinder numbers start with passenger side front cylinder as number 1. Number 2 & 3 are passenger side, middle then back, respectively. 4, 5, 6 are drvers side from front to back.
If the numbers on your Coil-pack are faded/missing, post back and I will check my truck for you.