Thanks for choosing FixYa and welcome. This could be a spark plug, wire, or coil. I would think it is the #4 cylinder that needs looked at. If I was you, I would go ahead and change all plugs/coils and wires. There are other things that can cause this that are much more complex if changing the plugs/coils and wires does not work. It could be something electrical. Anytime the check engine light blinks, this usually means internal engine damage. I would find the #4 cylinder and change the plug/coil and wire first. If it doesn't help, it will need to be looked at by a mechanic. These can get tricky. The ignition system is very complexed.
Most likely a plug, could be the plug wire ?
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