Engine will not idle down even when warm

I am just needing possible problems of why my engine will not idle down. I made adjustments to idle screws at throttle body. Cleaned both idle valves. Car runs really well. No hesitation or stumble, but it just will not idle down. Do you think that the throttle plate inside is bent or something is preventing it from closing all the way? And no cable is not too tight? Heck it may be something entirely different. Also, no codes.