1966 Dart troubleshooting

1----So far as your video. When the throttle is "down" on the curb (warm) idle, most fast idle cams have a STEP which will not allow you to close the choke with your finger. You must "imitate" the choke thermostat, that is, apply a little "closing" pressure the same way that the choke spring does, then open the throttle with the other hand

2---It's not clear to me what if anything you have done for a tune --up. At this point I'd do a major tune of the engine. If this is an original older engine with adjustable valves, do so.

3--Run a compression / leak down test. Inspect / change the plugs. If the cap/ rotor/ wires are a little dirty, and mileage is unknown, change them.

4--Change the points and condenser if there is ANY question, and set the timing at least "as advanced" as the book + about 3-4 degrees.

5--THEN attack the carb. As old as these girls are, there is no reason to assume that any part of the fuel system is in good shape. Replace the fuel line rubber hoses if unknown. One at the tank, one at the pump, and any others up to the carb. TEMPORARILY run a plastic filter so you can inspect for dirt in the fuel, then change to a METAL filter.

Pull the carb apart, clean it, use aerosol carb cleaner to pressurize all carb passages and make sure they are clear. Put a kit in, if the carb float is foam, be aware that these can sink over time. ("fuel logged")

6--AFTER you have set the points (dwell) and then timing, and AFTER you have adjusted the valves, warm it up and set the carb idle. Don't worry about "how many turns" the idle screw is. Adjust the mixture to "what the engine likes." Adjust WHEN WARM. Go back / forth between idle and mixture, set mixture for max vacuum or max RPM, then "just a touch" toward "lean" (clockwise) direction. Engine MUST be warm.