Choke Sticking ?

Hey guys,
I have a 1991 K10 1.0 LS Auto Choke with 20,000 miles and it seems to have a little problem.
When I start it from cold, it starts fine, but when you leave it idling for a few minutes the revs carry on increasing gradually until you blip the throttle and then they go back down. Something is sticking but I don't know a great deal about carbs. Any advice would be greatly appreciated. Cheers !
 
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