How to adjust idling for 1977 impala - 1983 Chevrolet Impala

The only thing close to what you are asking would be the adjustment to the main throttle blade before the intake manifold. However with today's cars that is not the only way to fix the idle.....best to have a mechanic do it.

Well then you have a problem with the IAC - idle air control valve , air fuel mixture , mass air flow sensor , vacuum leak or some other problem with electronic fuel injection , OBD 2 ,emissions etc... There is an idle speed , minimal setting .Adjusting this will throw off the computer system , check engine light will come on an you won't be able get it to go out ! The PCM - engine computer controls the idle speed through the use of the IAC - motor or valve . Idle Air Control Valve You need to have it fix properly ! Check engine light on ?

Be sure you have run a quality carburetor cleaner through your fuel system...also fresh plugs, spark plug wires, and replace ALL air filters and clean passages...this is the least costly performance enhancement...Hope this helps.

idle is not adjustable
pcm decide the idle rpm by iac valve
try to clean trottle body plate and iac hole with combustion chamber cleaner and pour the rest at the trottle body engine idle enough not to stall engine

there is a screw on your valve body that holds your throttle u can adjust that.

did you disconnect the negative battery terminal before changing the sensor?

Run a can of really good fuel system cleaner thru it,and make SURE your oil is a good quality and doesn't need changing. don-ohio

1977 ? egr valve is leaking, or the accelerator pump on carb is bad

ive found many of these cars with this problem, first remove vacuum hose form fuel preasure regulator this is located on injector rail, start car and see if gas is leaking from fitting for vac hose , if so replace regulator, the next thing is to make sure the throtle body is clean, use throtlebody cleaner and tooth brush to clean, and last would be the idle air control valve, this valve keeps the idle and adjusts it when needed. hope this helps,

sounds like there is a problem with the automatic choke / or choke unloader vacuum diaphram. Fast idle and curb idle might need adjustments