Snapper running roughly after choked engine

I have a Snapper rear engine riding mower model 28125BVE, which has a Briggs & Stratton Intek™ OHV AVS® engine, 12.5 hp. When in use, my husband accidently choked the engine. It took a long time to get it to start again, and it was running very low and rough, and blowing dark smoke...I'd probably say blue, but I'm not positive. It rested overnight and it started on the first turn, but it was still running low and rough and smokey. We're both new at fixing stuff ourselves, so I was wondering if I could get some ideas...

All I could find in the engine's owner's manual was "Do not choke the carburetor to stop engine."

 

Try a new spark plug and make sure the choke is not stuck. Try it without the air filter if that does not do it (do not mow without a filter in place )

 

Haha, yes the choke was stuck. We both felt silly for not checking that in the first place.

Thanks!