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What causes my engine to idle very high? on 2005 GMC Savana 3500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Tried MAF sensor, upper intake gaskets (possible vaccum leak), IAC (had to change whole throttle body can't buy IAC alone). Unable to find any vaccum leaks.
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