You need to do a Glove Test to take cylinder to cooling system leak off the table, i.e. blown head gasket.
It is an easy, simple and FREE test
Cold engine
Remove rad cap
If coolant is at the very top drain some out, so it is about an inch down, lower is fine.
Remove Overflow hose, and plug that outlet on rad, use gum, putty, vacuum cap, ect.........
Find the Coil Pack(spark plug wires) unplug it's 4 wire connector, you want a no start
Get a latex glove and rubber band, or a balloon or even a condom
Put latex glove on rad cap opening, seal it using the rubber band.
Cooling system is now sealed, and a cold cooling system has no pressure and can generate no pressure, water pump just spins, it isn't a "pump"
Now crank the engine and watch the glove
If it starts to bounce then you have a leak from a cylinder into the cooling system.
A cylinder generates 150+ psi of pressure when starter motor is turning the engine, it's compression.
If glove just lays there no bouncing then all is well, move on to Radiator or water pump circulation problem.
If glove does bounce, remove 1 spark plug at a time and crank engine, when glove stops bouncing the last spark plug removed was from the leaking cylinder.