What could be wrong with my 1986 Chevy Suburban truck?

AdelaideB

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I have a 1986 Chevy Suburban truck 2500 and the idle on it is constantly getting stuck on full throttle and I have to punch the gas pedal to bring it back down but then it'll go back up again and stay there until I punch the gas pedal again.
I know the idle is supposed to be high while it's warming up but once it's warmed up isn't it supposed to remain at a normal idle?

I think the choke might be getting stuck and we sprayed carb cleaner into it and that seemed to help for about a week but now it's doing it again.

What could be causing this any ideas?
 
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