I actually think that you are being deliberately obtuse and argumentative, and you do that because you enjoy getting a rise out of people. But in the event that I am wrong and you are just obtuse by nature and are literally asking questions I will tell you.
We have a report of a rough running car and a check engine light. We have a report of a trip to an auto parts store for code reading. The interpretation of the code reading given by the OP had to do with cylinder 4 and “firing.” I will lay 100 to 1 odds that the actual “results” found at the AP store was trouble code P0304. This code indicates that a misfire was detected on the #4 cylinder. Its pretty much the only code that would have someone come away with the interpretation given in the post. There are no codes for “not firing consistently,” there are no systems that monitor the actual spark, and there are no procedures in place at auto parts stores that would allow one to determine this.
As to what a misfire code indicates, I have already explained that. It is not in any way based on any actual detection of an issue with spark. It does not tell you that spark is lacking. It does not tell you that spark is consistent or inconsistent. It simply tells you that combustion didn’t happen in a cylinder. That is all. The report is generated when the crank position sensor picks up a glitch in the rotation of the crank shaft. Period. Unless the OP clarifies there is no way to know. But I’m still on 100 to 1 odds that neither the auto parts store people nor the OP have any actual knowledge whatsoever of the spark that may or may not be occurring consistently or inconsistently in any of the cylinders. All there is here is a half-baked interpretation of a misfire code.