Check the motor mounts
car run good but has a little vibration idle or running
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.
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.
from the factory the speed is set and cannot be changed, unless you disconnect the coil spring. You can latch the spring somewhere on the housing at your desired speed. this speed is determined by the distance away from the idle stop. example, you can reverse the spring to move stiff lower spring up against the idle stop screw. then using a screwdriver turn the idle screw in to achieve your desired speed.