Started 2126 a few days ago---start OK, idle normal---at first red lite, idle was at about 2500 RPM---pulled over--throttle spool was returning to stop--no sticking--drove home at 2500 rpms---would not idle down---drove again today---everything now normal---good idle---any ideas?? Idle microswitch was closing when problem occured. Concerened this may happen again. Thanks for any comments.