Running rough at cold start

Posted by Dave O On 2021/11/7 17:15:34

My 1949 has arrived, I was told by the previous owner it runs rough at a cold start then smooths out great after about 2 min. He was right! and the colder the temp the harder it shakes. I don't know where to start. It does the shimmy and shake, then remarkably smooths out just perfect. While its running rough I do have to keep the RPM's up otherwise it will die during the 2 to 3 min. What the heck would cause this?

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