1998 Ford F-150 Q&A
1998 Ford F-150 Question: how to determine which coil pack is bad.
Which engine? - pushrod
I would strongly recommend a set of eight as well as goo with an OEM or high quality coil. You could try disconnecting them one at a time until you find the one that does not effect how it runs and know that is the failed one as well. - Ron Haugen