Going old school with this vid/ I don't have a O2 sensor so the best way to tune my engine is with a Vacuum gauge. Vacuum gauges are cheap and are a great tool to help diagnose lots of problems with your engine. They are still used today, they are now called MAP sensors.

Want to pick up a vacuum Gauge for yourself use the links below for my recommendations from Amazon:

cheapest Vacuum gauage on Amazon : https://amzn.to/3UbFufr
My top choice from amazon: https://amzn.to/3fi0gv4