#5568, "RE: 420a Idle is at 4000 RPM need help!" In response to In response to 0
Perform a boost leak test (yes, I know you are not boosted). Pressurize the throttle body from an air compressor to be 100% sure you have no leaks. That is really the only reason I can see why you have such a high idle, especially since you mentioned you verified slack in the throttle cable.
