Welcome back.

How many miles on the vehicle?
Roughtly what part of the country are you located? (This is a temperature question)
Which engine?
What are the codes?

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Miles: 127,435.7
Michigan its 45 right now temps go up and down
5.4l
PO305? dont have my code reader in front of me

It misfired for about 10 seconds on the highway. Real violent, flashing Check engine light. But then stopped. I drove it home somewhat stupid but it was only like 3-4 miles.
When I got home it had stopped misfiring I fired it back up about half hour later missing again. I already got a new coil pack and installed it. Running good know but who knows? Maybe I was too swift. OOPS

That was longer than I expected, oh well.

 

Not sure I understand your post above.

Is vehicle currently running poorly after the "coil pack" was installed?

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No its running fine now. I was just saying maybe I was too fast to post. Since I had not tried what I might thought be the solution. Since this was the problem last time. I just hope this doesn't come back in another few months these coil packs are not cheap. Or worse the spark plug goes.

 

Nine.of us will really know. We need the code(s) and more data. Pull the spark plug and analyze it.

 

Fair point, I must say I jumped the gun making this post. I already kinda knew what was up. I just didn't want to admit to it.