Do I have valve problems?

Hello, Plugs and coils are not the only thing that can cause misfires, but they are typically the cause. Other issues that can cause them are failing or dirty fuel injectors, lack of fuel pressure, vacuum leaks, and mechanical damage. This is not a comprehensive list, but it should go to show that misfires are not always the responsibility of the ignition system. I recommend having the vehicle diagnosed professionally to avoid any unnecessary costs connected to replacing parts erroneously.