multiple cylinder misfire

My 4.0L 2001 TJ has extreme misfires. I will link a video below. I just replaced the sparkplugs to iridium ones. I did this because I saw a YouTube video of a guy who seemed to have a similar problem and all he did was replace his sparkplugs with what happened to be iridium ones so I did the...

So a little update. I have been chasing issues ranging from my dash gauges shutting off, jeep intermittently stalling, multi cyl misfire, all 4 o2 sensors heater fail high and low voltage, chugging, crank sensor. You get the point. I cleaned all connections and traced all wiring. Found nothing...