Chevrolet sprint 1986 idling high trying to find the

you need to adjust your idle screw on your carb i could tell ya how on that type of car but your running to high of an idle and flooding your cylinders thats y it is idleing rough and you can smell the gas, adjust your idle screw back a little and then you might want to check your plugs and make sure you didnt fowl and of them with it running rich

i have the same car and mine does the same thing i think its a common problem for the car does yours stall out after roughly 15 minutes after just sitting at idle ?

Remove the air cleaner to access the carburetor.
Note the right side of the carburetor where the accelerator cable is connected.
The cable is connected to the accelerator cam which is stopped by the idle set screw.
The Idle adjustment screw head is pushing down on a spring, which should help Identify the correct adjustment screw.
Be careful not to adjust the smaller mixture screws, unless you have a vacuum gage.
If your Idle is too high you may get after run or knocking. I would set the timing then adjust the idle afterwards.
I hope this helps out since I do not know if the carburetor is stock or not.

WHEN YOU MOVE SCREW YOU CHANGE TPS VOLTAGE READINGS YOU WILL NEED TO MONITOR TPS VOLTAGE AND ADJUST BACK TO SPECS DONT KNOW EXACT BUT SHOULD BE AROUND .50 AT IDLE

try doing the mixture screw as well

Is these a carburated engine or fuel injected?If it is a carburated,look for adjustment on the throttle,near the linkage,back it off the throttle until desired rpm.

check your throttle control module

While looking at the engine from in front of the car with the hood up..
Locate the TBI assembly ( follow the air intake tub from the cor support back. It leads directly to it ). Next look on the lower left side of the TBI just above the throttle linkage connection to the TBI.
you will see what looks like a little molded bullet sticking off the side with a screw sticking out of it making contact with the linkage assembly. On the back side of that little bullet you will see a torques head type screw head. adjust that forwards to increase idle speed or back it off to lower idle.
If you have a high idle condition the chances are it is not due to the idle set screw. Its more then likely either deteriorated vacum lines, deteriorated TBI gasket or a bad Air Idle Control Motor ( IAC ).
If you adjust the screw and nothing happens worth noting then check the vacum lines and replace. If nothing happens still then change the TBI gasket where it mounts to the intake.
If that doesnt do it then your left with the more costly option of changin out the IAC for a new one. They run from $75 - $125 depending on where you shop.
If after you change the IAC and it is still acting out then you may have an intak emanifold leak, or a head leak.

well. your idle is just high. you can get a screw driver and find the idle screw on the throttle body. . and jsut adjust there , , that is if there are no problems.

now it also maybe a leaky intake. . . . but i think its jsut more of a small adjsutment. . 8)

not sure what LSD is , ?

but on this car.
one of the below are wrong.

Dashpot stuck on.
Air leaks anywhere in the intake system.
ISC stuck wide open.
or Throttle plate screw was cranked in too far.