So I did do a search, and got a little info but still have questions. How can you tell if the carb is still on choke or not? I have an Edelbrock 1406 that is on the truck. Previous owner had a problem with it diseling when it warmed up. I warmed the truck up to when I though it was off choke, and adjusted the idle mixture screws. However when I adjusted the idle screw nothing changed. The truck also starts with a low idle now. I have to give it a little gas right after she fires up or she sounds like she wants to shut down. The electric choke wasn't hooked up when I bought it so wired it up for power. I'm slowly unpacking so haven't dug out the multimeter to check if it's got a good ground, and power source. I'm just trying to get her running decent for now, and not dumping a lot of gas down the intake so I can fix things as i go, once I get going.

 

Easiest way to check is to pull the air cleaner off and see if the choke plate on the top of the air horn is open or closed.

Choke is on with the choke plate closed. Choke is off with plate open.

If choke is set properly, spring inside the choke cap should close the choke plate when cold and slowly open once engine is running and supplying 12 volts to the choke cap.

To adjust the choke when the engine is cold, loosen the retaining screws for the choke cap and rotate it until there is just enough tension to close the choke plate completely. This should get you pretty close. Tighten the retaining screws.

Likewise on the drivers side of the carb, there will be a cam that engages the fast idle screw when the choke plate is closed which will give you your fast idle when first started cold.

It works like this:

When cold, you depress the gas pedal which allows the spring inside the choke cap to close the choke plate. A rod off the other end of the choke plate moves a cam which the fast idle screw then rests against to hold your throttle plates partially open and gives you your fast idle speed. As the engine and choke cap warms, the choke plate rotates to the open position which also moves the fast idle cam. The throttle plate is then allowed to close against its regular idle speed screw.

Ensure you have 12 volts to the electric choke with the engine running otherwise choke will never open.

Hope this helps.

 

When you adjusted the idle mixture with no effect it indicates that they are plugged.
You clear them by pulling the screws completely out and blowing some compressed air down the holes then reset the mixture. It doesn't take much air and there are no delicate parts in that area of the carb to damage. I have even used a can of compressed air keyboard cleaner to blow them clear.
Once you get your idle mixture working again, drive your truck for a few miles to get it completely warmed up. With it still running, pull the air cleaner and check that the choke plate is fully open. If you can push it further open with your finger then you need to adjust it.

 

Thanks for all the input. I read some of it in the edelbrock install manual when I looked it up online, but the added info here should help me troubleshoot. I adjusted the idle mix screws to get the idle speed down, but the idle speed screw on the throttle linkage gave me no joy when adjusted. Could just be the truck wasn't fully warmed up. Now that the truck has cooled down, and I found my multimeter I'm going to adjust the choke first. I don't know how to explain it, but I think she is running lean as after adjusting the idle mix screws she smelled "hot". I'm gonna try the I think it was 1 1/2 turns out from full closed (on the idle mix screws), and see if I can move forward. I'm hesitant on driving a few miles as the left tire rubs on the pitman arm turning right. Might find a way to make all left turns and go that route. (rogue40 I just noticed I'm down the highway just a bit from you in Oak Harbor)