“Plug Chop Plug Chop Plug Chop” I cry!
“Until you learn to feel me,
You’ll have to do it by eye.”
When it's dirty and black, it's got the ****s,
You have too much gas you are running rich.
When its hot and white, but looks pretty clean,
You're 'bout to blow your **** up; you're running lean.
Nice way of remembering it according to that site.