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Is the ECM throwing codes? If so what are they?You might try this ( I just skimmed these posts) it will reset the IAC.Disconnect the battery for about 30 seconds and reconnect.Jumper the A&B terminals on the ALDL connectorTurn the key on and leave it on for about 30 seconds.Turn it off and remove the jumper. Then try to crank.
This may be a stupid question as I know very little about TBI engines. Do TBI engines use a EGR valve?
Make sure the vacuum supply line to map sensor is not plugged up with carbon. If it is, map sensor will respond to slow and have skewed readings.