High idle RPMs and check engine light with no codes

Hello, I'm Danny.

Even when the check engine light comes on and goes off that still means a fault code is stored.First thing to do is have the code(s) read. If you don't have access to a code reader/scanner most of your local auto parts will check for free. Here is a tutorial showing you what is involved:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

After having this done get back to us with the codes.Having these codes will help us to properly diagnose your car.Hope this helps and thanks for using 2CarPros.
Danny-

P0507 - Idle Control System RPM Higher Than Expected. So the computer is expecting an idle speed of 600 rpm's based on all of the settings and readings it has, but instead the idle is 1000 rpm's. A common cause for this is a vacuum leak.
A quick question, is this Sebring a two door coupe or a four door sedan/convertible? Asking because although they share a name the two door is a Mitsubishi based car while the others use Chrysler platforms, The engines are also different.

Okay, that the Chrysler engine and platform. Easy testing process. Get a can of carburetor cleaner. Start the cold engine and spray a small spot on the hoses and intake at a time and just listen to the engine. If there is a leak the engine will rev up from the extra fuel. A good visual inspection as well may find it faster.

TPS issues wouldn't give you that particular code or the high idle. A vacuum leak, failed PCV (acts like a vacuum leak) or an issue with the idle air control system are the main items that would cause a P0507. You changed the PCV already with no result. The next step would be to verify that no air is getting into the engine through leaks. Then testing the IAC and cleaning that out would be next.

Could be anywhere, that's why I suggest the spray to start with, to help narrow it down. Being 13 years old I would check any vacuum lines and the intake manifold. A quick test on some would be to simply squeeze them. If blocking a hose suddenly changes the idle start hunting along it and its components.