93 GT idle issues...

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Pull of the IAC and clean it out real good with carb cleaner.

Set the TPS voltage to .90-.99

If your AC is off, turn it on, and that will drop the idle by 100-200 Rpms... :p
 
yeah, since it is intermittant, the IAC probably has a hiccup. see if you can notice any other rhyme or reason that it will hang when it does.

good luck.