Replacing spark plugs and ignition coils on Toyota FJ Cruiser

The check engine light suddenly came up this week on the dashboard, and the entire FJ was shaking badly.
The OBD reader showed this error message "P0306 Cylinder 6 misfire detected," which means that the spark plug in cylinder 6 needs replacing.
I wanted to replace all 6 spark plugs along with their ignition coils anyway but I kept delaying it because one of the bolts on one of the ignition coils is broken, which means it will be a pain in the ass to extract it. And of course, that broken bolt is on cylinder 6, which is causing all this mess. 😒
When I started working on it, I realized that there's another broken bolt on ignition coil 4. I also discovered a massive oil leak from the gasket on the left valve cover. Spark plug 6 was drenched in oil. 😫
And of course, I found a lot of rust in there that I had to deal with. Replaced all the rusty bolts with brand new ones. I also removed the engine brackets and painted them with high-heat paint. One bracket couldn't be removed because the bolt is stipped, which I have to deal with later. 😔
After I replaced all spark plugs, the FJ is back to working normally, but I still have to fix the leak from the valve cover. 😔
All the products and mods that I bought for this FJ are available for purchase from the link in my profile. I installed all these mods by myself, and you can do too.
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[@sharhansalam]

Hi, How is the performance of the coil?

[@TheDarkFJ]

The FJ has been running smoothly every since. The fuel consumption is much better too.