Rough Idle after running the engine for an hour?

Thank you for your response, Ken. This is the data stream when the engine just starts up.

And in the last 10 seconds of this video. That's where the engine acting up rough.

Hopefully that data helps. Thank you so much Ken.

We are in a tropical area. But it was impossible to reach that temperature, especially since the engine had just started, and I recorded the video early in the morning. Thank you so much for the help, Ken. I highly appreciate it.

Dear Mechanics,

The issue is RPMs fluctuations after the car runs for more than 30 minutes.

Engine: 4B11

Things I have done:
1. Cleaned fuel injectors
2. Cleaned throttle body
3. New Fuel pump and filter
4. New Sparkplug
5. New air filter
6. Tried new O2 sensor, but I returned the old one since it's not the issue
7. New Drive belt

Scenario:
I got a check engine light and upon scanning the code is P0132, after removing and cleaning the O2 sensor and the code is gone. While having the code I didn't get the RPM fluctuations.

After a week running the RPM suddenly fluctuates, especially at a stop. After doing the things I mentioned above, still it didn't fix the issue.

Since the sparkplug I bought are pre gap, so I changed the gap. One thing I noticed when I lowered the Gap to 0.7mm, the RPMs fluctuation at a stop is gone but only when running, it's jerking.

Can someone help me identify the issue? I am thinking the ignition coil might be weak, but I don't want to waste money anymore if I am wrong. I need your opinions. Thank you and God bless!

My owner's manual says NGK FR6EI, it's the one I bought and tried 1.1mm GAP, the wider the gap, the more the rpm fluctuates. Before it goes 30 minutes, but at a wider gap of only 15 minutes. The sparkplug used before I replaced the new one was NGK BCP6ES.

I forgot to mention that, before I removed the old sparkplugs, it has oils. I am not sure if that's a factor. But, after using a new sparkplug it never happened again.

Okay, I will order a tool for checking compression. I have 1 question, I found out some oil leaks from the sides of the engine. Can a bad rocker cover gasket can be the cause of RPM fluctuations?

It's different in our country, everything has a price. Maybe a few will have it for free. Anyway, I noticed that when I ran the car over 100km/h, a burnt smell came from the dashboard. And I checked the engine near the exhaust. There's an oil mark. I think when running that speed the oil escapes.

No, I have tried on my sister's car. The temperature are the same. By the way I have done the compression test, and it looks good. All Cylinder has the same result 160 PSI.