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Need idle help

My 89 gt is having issues idling. It idles rough and sputters when I start it, after driving a few minutes it clears up and idles good. After driving for a while (20-30 minutes) I notice it idles really fast. Any help is appreciated
 
It's pretty straight forward.
Just unbolt the IAC, clean all the old gasket material off, then spray some carb cleaner inside. Give it a good shake to make sure it gets in all the ports good, dump, repeat a couple times, then empty it out. Make sure all the carb cleaner is out and the IAC is dry. Use a new gasket or RTV and reinstall.
 
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