You have the mower sitting in front of you.
We have the words you typed on the screen.
If the engine is missing find it :laughing:
If you have a problem you want help fixing, then a full description, starting with the model & code of the Briggs engine then every thing it does, what you see , hear, feel & smell
What you did to the engine last, what the oil level is, what the oil feels & smells like , how long has this been going on , is it getting worse, what grade of plug did you fit, how old is the engine haw may hours on it what type of yard do you have