Damn Annoying This Is Help Please

[LatinR33]

Well its another idle issue but not like the ones I have read about elsewhere on this forum. I was driving yesterday all was good until half way through my drive my idle went from normal to 1,000rpm and just stayed there wouldnt go down i parked the car then drove off car was fine for like 5minutes then again same thing. Got to my freinds house then drove home not a problem idle was normal all the way?? What could have caused this. Same thing happened last week and I reset ecu all was good till yesterday when it decided to show up again. Its like my idle has a mind of its own. one second idles 1,000rpm then all of sudden gone back to normal. You you think another ecu reset and a good thrash would do it?? I was told you need to give your car a good thrash i didnt exactly do that when i reset it last week. any ideas?? i was going to speak to a mechanic to do the aac, valve check for leaks and clean afm but if it could be something else i should do then tell me.