This is probably a spark plug out of gap or very worn take them out 1x1 and check the gap and condition of them and there boots /roll them between your fingers looking for cracks at the base of the boot and try to bend them back n forth if they are soft and bend easily they are leaking voltage from the + spark to the -ground even a pin hole will cause the PCM TO DETECT A MISFIRE OKAY SO REPLACE THE BOOTS IF THEY ARE NOT PRETTY CLOSE TO RIGID A LITTLE BENDING IS OKAY BUT MUSHY IS NOT ///I TRIED TO POST THIS ANSWER IN ONE POST BUT COULDN'T PLEASE LOOK AT COMMENTS FOR THE REST OF THE ANSWER
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This is probably a spark plug out of gap or very worn take them out 1x1 and check the gap and condition of them and there boots /roll them between your fingers looking for cracks at the base of the boot and try to bend them back n forth if they are soft and bend easily they are leaking voltage from the + spark to the -ground even a pin hole will cause the PCM TO DETECT A MISFIRE OKAY SO REPLACE THE BOOTS IF THEY ARE NOT PRETTY CLOSE TO RIGID A LITTLE BENDING IS OKAY BUT MUSHY IS NOT ///I TRIED TO POST THIS ANSWER IN ONE POST BUT COULDN'T PLEASE LOOK AT COMMENTS FOR THE REST OF THE ANSWER