2003 toyota avalon gets check engine light and goes when idleing

The very first thing I would check would be if the battery cables are clean and tight. After that I'd lean towards a bad ignition switch. Do you have a ton of keys on your keyring? wiggle your key while its on to see if you can recreate the problem.

Have you done anything to it. When was the last tuneup. And why the hell are you racing the engine to 5k. That's just wrong. It should idle around 800

Hello. Welcome to FixYa. Please allow me to assist you. The Check Engine light comes on for many, many different reasons. The most common reason is the gas cap being loose. I would check the cap for being loose. If it is loose, drive the car for 10-15 miles to see if the light goes out. If the cap is not loose, you should go and take the car to someplace that can scan the car's computer to get the codes, the reason for the light being on. Autozone stores do this for free. Get us the codes, and then we can isolate your problem better.

Some "check engine" light in your dashboard? If YES, need to scanned the PCM (computer) to know exactly what fault code is stored there. If NO, the crankshaft position sensor may fail, causing engine stalling or a failure to start. Replacement or the failed sensor will commonly correct this problem.

Also, keep in mind that on the 2.7L V6 and 2.4L 4 cylinder, a defective Exhaust Gas Recirculation (EGR) switching valve may cause an intermittent rough or unstable idle engine.

Stalling synthoms... you can have a plugged exhaust, plugged fuel filter, bad airflow meter, problem with the ignition system, incorrect timing belt/chain setting, and failing fuel pump....I'm sure there's more but that should get you thinking.

Keep us updated.

Problem with idle control valve, is located underneath throttle body, you can clean the valve, but there is 50 50 chances that is going to help also may get worst, I would recommend replacement.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/flavio_517b938f50183b92

check idle air controll motor

Sounds like the IAC valve is carboned up. This valve can usually be removed easily with 1 connector and 2 bolts. It is how the engine controls the idle speed. Many times a can of carb cleaner and working the piston back and forth on it will free it up for many more miles.
Turn on the a/c at idle. does the idle speed change?

its the IDLE Air Control valve. Needs to be replaced

Sounds like you idle air control valve is going bad. They start acting up on a hot engine due to sticking or high resistance through its internal windings. It will get to the point where the engine will stall every time you take your foot off the gas.
I suggest getting it replaced and the throttle body cleaned at the same time since it will need to be removed to replace the IAC.

mcdevito75 here, Sounds like the idle speed motor, Ford is known for these idle speed motors going bad, in the later stages the car races like crazy. have your repair shop check this idle speed motor and change it.