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Q: miss fire on 2000 Ford F-150 Lightning

Asset 21
I just replaced all coils ,pluges, inner cooler, lower intake, injecter @ # 6 it still miss fires good compession.
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Is it only one cylinder? The code returned to the same cyl. that was misfire before?
We need to know a bit more about the history on this.
Hal has the right questions about the connector boots and the cracked insulation.

Zee
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Random or specific cylinder? Did you replace the boots as well. Check the spark plug again for cracks. Could be a bad injector...
it could also be a lifter or cam follower which will cause the first compression stroke to show compression but after that you will not have compression causing the miss i have seen this several times personally
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