I have a 22 " Weedeater Lawn Mower. Very simple model, no bells or whistles. It was running fine, I went inside to take a break for awhile, then when I started it up again it was sputtering. I turned it off, checked oils and gas again (both were fine) and it still sputter with it becoming worse when I pushed it.
The next day I changed the spark plug and air filter. No change in the sputtering.
What should I do ?:(

Sounds like you may have water mixed with your gas.

I would drain the tank and try it with "fresh" gas.

Yep, sounds like good ole fuel contamination to me.