Possible Vacuum Leak, With Graphs

[2001LSHoe]

Alright I’m back. It’s finally gotten cold enough to really replicate the symptoms I had been having earlier.

There’s a bad misfire on cylinder 3 and sometimes 1.

 

[2001LSHoe]

Wanted to post the misfire history. I’ve already changed spark plugs on cylinders 1 , 3 and 8 twice in the last 30,000 miles. I also changed spark plug wires at the same time as well. That was the summer of 2023. I started having issues that winter when it got cold.