More times than not, it turns out to be the TPS sensor
The idle control valve works by regulating the idle speed of the engine. The idle speed of the engine is usually controlled by the engine of the computer.
May be a bad ignition coil - each cylinder has its own located at the top of each spark plug
of Idle
The idle speed control solenoid controls the idle of the engine when the air conditioning is engaged. Since the ac pump draws down the engine idle the solenoid increase the idle when the ac is on.
Idle speed is automaticaly controlled by the computer. If idle speed is not correct, the car has a vacuum leak or a sensor problem.
With the engine running, turn the idle screw until you get the speed you want.
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To adjust the idle speed for a Slant Six engine, first ensure the engine is at operating temperature. Locate the idle speed screw on the carburetor and use a screwdriver to turn it clockwise to increase the idle speed or counterclockwise to decrease it. Ideally, the idle speed should be set between 600 to 800 RPM, depending on the specific model and condition of the engine. After adjustments, double-check the idle speed with a tachometer for accuracy.
If you mean hunting at idle, the problem is caused by the idle speed being set too high or the idle switch is not properly adjusted. When the throttle is closed as indicated by the idle switch the fuel is cut off by the fuel cut solenoid until the engine speed drops below a preset speed. If the engine speed is higher than that speed and the idle switch is closed there is no fuel for the engine, thus the engine speed drops. When it drops below the preset speed the fuel is turned on and the engine speed goes back up.
To adjust the engine idle on a 1990 Mazda Miata with a 1.6 engine, locate the idle adjustment screw on the throttle body. Start the engine and allow it to reach normal operating temperature. Then, use a screwdriver to turn the idle adjustment screw clockwise to increase the idle speed or counterclockwise to decrease it, aiming for an idle speed of around 850 RPM. Always double-check the idle speed with a tachometer after making adjustments.