Misfiring when engine is warm

Engine: KA24E

Description: gurgling/loping of the exhaust at idle. Only when the engine is at operating temperature and at idle.

Additional note: EGR and EVAP delete. All lines are removed except fuel regulator. They’re all properly plugged on the exhaust manifold and all the vacuum lines.

I’ve already: - checked cylinder compression pressure - replaced new spark plugs and spark plug wires - new distributor cap and rotor - verified spark on all 4 cylinders - verified timing (around 7 deg retarded is the sweet spot from preignition and poor idling) - new fuel injectors - new fuel filters and fuel lines - checked fuel pressure - verified there’s no vacuum - replaced temperature sensor - replaced O2 sensor

I am struggling on fixing this. I even tried to search all over the web. The only thing that’s same to my issue is this: https://www.reddit.com/r/hardbody/comments/1bten1l/94_nissan_d21_misfire_when_warmed_up/

However, I am struggling to understand the answer. I am electrically illiterate and I have OBD I.

I need help.