Check engine light at high rpm on 2012 5.4L

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khooddad

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When giving her the onion, the check engine flashes and then goes away after backing off. She has 118k miles on her. It’s the 5.4L. She runs great besides the check engine light at high rpm. Any ideas where to start? Will a code be stored, so I can connect a reader? I’m thinking a detected misfire. Gonna change plugs and wires first as they are original equipment.
 

Motorcity muscle

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Flashing engine light is nothing to let go. Should store a code, bet on a misfire. Most of the time going to be plugs with acceleration and flashing light. Do not continue to drive it, if a cylinder is dumping raw fuel into cat you will ruin it.
 
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