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you cannot adjust the iddle on a 84 fiero. the iddle control is made by the computer. there is a air control selenoid on the left of the throttle body. the selenoid controle the iddle air flow. to make sure the selenoid is working properly, you can remove the air boll and filter so you can see the point if the selenoid. when the engine is passing from high revolution to iddle, the selenoid will move. if it moves it is probably in good working condition. if the iddle of the engine is too high, you might have a vacumm leek somewhere. check all the vacumm hoses for proper working condition.
Because the IAC valve is faulty.
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The idle sensor on a 1991 S10 4.3 can be located at the engine bay.
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ABS brakes should have no effect on engine idle, but a bad power brake vacuum booster would have an effect on engine idle.
Maybe you will need to clead the IACV (iddle air control valve), use a carburetor cleaner spray... Jorge,
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to: Maintain a smooth specific idle under varying loads, such as when going from Park to Drive , or when the A/C is turned on it should raise the RPM slightly to handle the increased load.
you may also check your mass air flow sensor one common cause is a faulty EGR valve. Check your computer diagnostics by using a code scanner.
Yes, black death is a very deadly disease. It peaked in Europe during the iddle ages.
I have the same issue, every now and them it will loose iddle and will shut off while stoping at a trafic light on in traffic, I have no idea.