John Deere wont run right

[able]

I have a John Deere Z235 with 325 hrs- started spitting and sputtering, changed fuel filter, spark plugs and added fuel additive- same thing- so I shot b12 into carb- ran great for an hr- put it up, week later went back and it spit and sputtered again!

 

[bertsmobile1]

Pull the carb off and clean it.
Take lots of photos of the linkages so you know how to hook it back together.