16.5 Briggs in a MTD motor runs fast

I just got a MTD Yard Machine 42"cut I think its a 1999

I did a short test drive when I bought it it was ok

I got it home started fine but it motor started racing

I checked and the choke was stuck so I cleaned and lubed it now it works fine.

but the governor rod was off and is bent I got it back on it ran ok at first

then when it got hot it started racing again any ideas?