High Idle 4,000 RPMs?

If the choke is closed fully it can raise the idle, I would open the throttle and open the choke manually, then release the throttle and start the engine to see if the idle is better. Also check the throttle cable to see if holding the throttle open, also check to see if the floor mat is holding the throttle open as well.

Please go over this guide which can give you some guidance as well:

https://www.2carpros.com/articles/engine-idles-too-high

Please go over this guide and get back to us.