Nothing, you have hit the rev limiter. The up and down is the computer controlling the rpm. If you drive it, it should rev past 3,000. The computer is designed to keep free wheeling rpm to that level. It will only allow a higher rpm if vehicle is in gear and moving with a load.
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Run the fault codes and find which sensor is affecting the engine speed . The engine speed limiter sensor may be faulty and causing the problem
SOURCE: 2002 Sebring Convertible Start/Fuel fuse blows intermittently
HAVE SEEN THIS BEFORE AND THE STARTER HAS BEEN THE CULPRIT..HAVE NEVER REPLACED A FUEL PUMP ON ONE OF THESE VEHICLES AT ALL
Testimonial: "I replaced the starter. This job is quite substantial. Also found the nut connecting the cable to the starter coil was not tight. I think it is fixed."
SOURCE: 2002 chrysler sebring 2.4l leaking water is it water pump
Those engines are noted for having bad head gaskets so I would look into having your head gasket cheked for leaks.If you look you should see the seem where the head(which is where the manifolds bolt to and the spark plugs screw into and the cams are on top)meets the block and check for any wet spots on this seem front and back.If it is leaking bad enough you should be able to run the car and let it get to operating temp.and have water presure in the engine then it will be easier to locate the leak.I would also check the oil for any creamy looking substance on the oil fill cap or the oil dip stick which would also indicate a head gasket problem.
SOURCE: 2004 chrysler sebring GTC convertible,
Your starter is drawing too much current. Recommend you replace the starter. Perhaps you can do it yourself using my tips at http://www.fixya.com/cars/r5973094-starter_replace.
Please reply if you have more questions.
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