out of the clear blue the idle will not go down. After trying all the above suggestions with no sucess try this: with engine off turn key to the on just before start position, then unplug the gray connector to the TPS for 5 or so seconds then replug. Shut off key and then restart. It happens to my car unpredictably and that is what clears it. BTW I have tried all diffent setting on the TPS and the idle bug still happens?