The coil packs are simple to replace, 5 minute job, its knowing which one needs replaced, the first one I shade replaced by the dealership because was under warranty, I replaced the next one myself about 2 years ago,
There was also some issue with brake fluid leaking from the master cylinder on wiring and staring a fire with them.
Sounds more like Stupid Duty to me!
You could try to look at the coils in the dark, have someone rev it a few times. If they are breaking down you might see arcing.
Unplug the MAF and drive it, replace it if it stops surging
I've seen many Fords and GMs with similar symptoms
Coil pack,![]()
90 % chance coil failure.
I know on 5.4 V8 trucks 90% of the time when a coil pack fails it cylinder #5. Its due to its proximity to the exhaust system.
Chris
Unplug the MAF and drive it, replace it if it stops surging
I've seen many Fords and GMs with similar symptoms