Thursday evening went to put coolant in my car and let it idle for a while to warm up ran perfect no problems what so ever then that night it start misfiring like crazy check engine light flashing and everything I changed spark plugs and swapped coils around, still did it. This morning got in it and started it, the check engine light was no longer on but it’s now only misfiring on one cylinder, before it was misfiring on multiple cylinders. Head gasket and other gaskets are all new. Please any advice would be greatly appreciated

P300, P301, P302, P303 headgasket is new I have a hole in my heater hose so Thursday when I put coolant in it and let it warm up it did fine went home and parked it and let it idle and that’s when it all started