below the throttle body... once you remove the intake hose, you will see it from the idle electrical plug
My 2000 V6 Sonata shakes while at idle also. I discovered I need an oxegen sensor and more importantly an "Idle Air Control Valve". 239.00 is the average and hard to find. .
Because the engine is running. Shut it off or give it gas and it will not idle.
Possible cylinder misfire and/or failing engine mounts.
I have a 2000 sonata and I had the same problem. You may want to check the IAC and or clean the throttle body.
it seems there a small screw back of the intake but the idle is control by the ecu.
The idle air control valve will be located by the throttle body.
From my experience, If your crank sensors bad the car will not start up at all.
The Idle Speed Control actuator is located right behind the air intake plenum
Hyundai accent idle speed
u cant its computer controlled needs a idle air control
Its right near your throttle body.
It is just next to the TPS (Throttle Position Sensor) on the intake manifold.