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I got a ‘14 ecoboost and put a 4 inch exhaust and a cold air intake but it misfires hard on full throttle, any help is appreciated
 

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2013 Ford F150 XLT 3.5 EgoBeast SuperCrew 4X4, 3.55 axles, 9.75" w/elocker
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Oiled filter ?
 
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Modinstrator
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Did this just start after the modifications? Is there a reason you mention these parts are these suspect to you?
 

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When was the last time your plugs & boots changed? Bad boots can allow arcing. When you pull the plugs look for evidence of arcing on the porcelan.

Also, check the gap. Over time, the gap tends to widen on these engines. The engine runs best with a gap around .028" even if bone stock. I personally run .025" because of my bolt-ons and tune.
 
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