Yeah, I've watched a few of those (listen to my noise) videos. I cannot tell squat from these so I would not expect that of anyone else. For this reason is why I am describing the symptoms of this vehicle issue.
Adding to my description of symptoms; there is no backfire, however there is some...
I have a 1998 3.4L 4 Runner 169,000 with poor power. I don't know the service record of this vehicle. I have fire on all cylinders. Unplugging #1-#5 injectors one at a time has very little affect on performance at idle.
At idle it sounds like it is missing. When increasing throttle, the...