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the scanners at autozone will only read ecm modules and not historical data. i would start by using a better scanner that also reads historical/pending codes
if it sees something and throws a code and it goes away, it normally leaves it pending for a few cycles. you might be able to determine which cylinder(s) is/are the one(s) missing and you can start your diagnosis there
simple stuff
check and compare/swap spk plug, wire, coil, injectors with a cylinder that is not having an issue. problem could be as small as an arcing wire or leaking injector, or a coil that may be arcing due to a crack
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