The only thing more mystifying than how many people don't know a bad running engine when they hear one is how many people say that
My neighbor pulled in one day with a car he had just bought and said how great it ran.
I said "Not bad for a V8 only running on 6 cylinders" (I could hear it from my house)
Lucky for him I popped the hood and found the 5-7 plug wires reversed.
This is exactly why I don't get involved in posts where the poster says the car runs great except for this or that, because a lot of people don't have a clue and will swear up and down it runs great.