Spark plug gaps?

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effingpot

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When I select a vehicle on Rock Auto and pick Spark Plugs, the options for the vehicle all seem to have different gaps - ranging from 0.041" to 0.044"
I would have expected them to all be the same. As I've been having a bit of misfiring it made me wonder what the difference is and if it can affect misfires?
Anyone know why the gaps vary and what difference, if any, it makes?
thanks
Mike
 

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Logan97

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I agree, motorcraft ignition coils too if you're replacing those. Tried using cheap alternatives, expedition didn't like it.
 
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