What wrong 1998 expendition 2 misfire 5.4?

Answer 1

The 5.4L engine uses a coil-on-plug system to create the spark for each individual cylinder. I have heard of an instance where both coils went bad at the same time on a V10 Ford Engine with the Coil-On-Plug system.

One thing you can do is have your Trouble Codes scanned (Auto parts stores usually do it for free if you don't have a scanner of your own) and find out what cylinders are misfiring.

Then, swap the coils of the two misfiring cylinders with two coils of cylinders that aren't misfiring.

After this, have the codes checked again, and if the misfire trouble code jumps to the 2 cylinders that you moved the coils to, the coils are both bad. If the trouble code indicates that the original two cylinders are misfiring, then the problem is elsewhere...

Your V8's Cylinder Arrangement is as follows:

Firewall 4 - 8 3 - 7 2 - 6 1 - 5 Front of Engine