If it is one specific cylinder, we can do some tests. First, the vacuum reading is lower than expected. Did you try using carb cleaner to locate a leak?
Next, try this. I need you to switch the cylinder 3 coil pack to a different cylinder. While you have it out, check the spark plug condition in cylinder 3.
If the plug looks okay, reinstall the coils in the different places and let's see if the misfire moves to a different cylinder.
Let me know what you find.
Sunday, July 31st, 2022 AT 9:45 PM