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I have a 1967 Duetto, all stock with original Weber carb and points/distributor system. Just recently it started with a rough/low idle speed/stalling upon start up. This occurs only when its cold-once it gets to full normal operating temperature, it idles just fine. It otherwise runs great-even when warming up, I can rev it with the hand throttle or gas pedal and it responds just fine, no missing/stumbling/hesitation. Nothing was done to the car or changed that caused this, it just started happening. It's not critical, but just annoying to have to worry about it stumbling/stalling for the first 5-10 minutes when taking it out for a drive. I have some degree of mechanical ability/knowledge, especially with Alfas, but I learned long ago that does NOT apply when it comes to carbs in general and Webers in particular! I don't like to mess with them, especially once they have been set up right and running properly. Which this car was for the first 4 years after I became its owner. Any help/advice much appreciated!
 

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The mixture generally needs to be richer when the engine is cold. You could change idle jets but then it might be less good when it is warmed up. I am confident that you could improve it a good amount by fitting a more modern ignition system and opening up the plug gaps to .035 - .040". I can recommend a 123ignition distributor with an MSD Blaster coil with an MSD ballast resistor. Big sparks will ignite imperfect air/fuel mixtures.
 
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