Make sure the pivot points for the TB butterflies are thoroughly cleaned.
If they're ok, reset the KAM (keep alive memory) by doing the following:
- Remove the positive battery cable, and connect a jumper from the end of the positive battery cable to ground for 10 seconds, and reconnect the positive battery cable.
- Start the engine, let it idle for a couple minutes with everything turned off, put the tranny in park/neutral, turn on the a/c for a few minutes, and then put the tranny in gear for a few minutes if you have an auto tranny.
- Drive the vehicle normally.
It usually takes 50-100 miles for the PCM to relearn the idle strategy.