I was the previous owner of that car.
I have replaced the spark plugs.
Brand new pre-cat 02 sensors.
Intake boot replaced due to crack.
ICV hose that is famous for breaking also replaced.
Amine, you could try swapping cyl1 and cyl2 coils with cyl3 and cyl4 for example, clear the codes, and see if they come back as misfire on cyl3 and cyl4, then you know it's the coils.
I doubt there are vacuum leaks as I've inspected and replaced what was needed.
Today is the tomorrow you worried about yesterday.