Spark plugs have been changed and fuel has also been changed. Code still coming up after reset. What else could be the problem?

Spark plugs have been changed and fuel has also been changed. Code still coming up after reset. What else could be the problem?

Oh, let's see... :
Loose connection
Faulty injector
Faulty plug wire
Valve clearance, intake or exhaust

You will need to determine if you're losing spark or fuel when this misfire code is set.

https://www.askmehelpdesk.com/cars-trucks/when-asking-about-your-vehicle-303903.html