My 2001 has taken a spell a few time since it was new in where all of the sudden after idling for a few minuets it had no throttle control and so each time you had to shut it off and start it back up witch took some cranking and the throttle control comes back but the idle sounds strange and is higher (900) and the trans has flairs at the shift points and it has an abrupt down shifts . Each time after driving it a few days it came out of it on its own. Up until recently it had now happened for 100K mi. It happened twice in the last couple weeks and I need to figure it out . Any one have any ideas ?