first step check all the fuses under the steering column left side panel (LH drive) if the fuses are ok (there is one fuse that supply power to the idle valve and some valve for emission) check the power supply goes to the idle valve, if you dont have a tester turn on the ignition swicth then unplug and plug the connector for the idle valve, if you hear it clicking your idle vale is good. Second step take it to the carburetor expert coz several mechanics hates carburetor nowadays.
carburetor or spark plugs
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Rephrase, Idle air control, idle circuit carburetor or
Sounds like you need to clean your carburetor. Before messing with the carburetor, check the fuel filter - it might be clogged.
To set the carburetor on a Toyota E engine 1300, you must have the tools to open the bolts. Refer to the pictorial image from the manual to set the carburetor.
The carburetor on a Weed Eater Featherlite SST25 is adjusted by turning the screws on the side of the carburetor. They control the idle mixture and idle speed of the engine.
The best way to do this is to visit a mechanic. They will be able to do the tune up properly.
If it is a fuel injected engine then you can not adjust the idle, it is computer controled. There is no idle adjustment. If it is a carburetor then there is a small screew over by the throttle cable, down towards the bottom of the carburetor.
Incorrect idle mixture (carburetor), or sticking IAC (idle air control), computer controlled engines.
Defective or malfunctioning Accelerator pump, idle mixture too lean, loss of vacuum in the carb during crossover from idle to the main jet operation from vacuum leaks
Yes, There is a screw on the carburetor or throttle-body that controls idle speed.
Idle air control valve sensor is located around the carburetor .