Hi Stovebolters,
The automatic choke has started acting up this summer on our 1952 1/2 ton pickup. It has a 1956 235 car motor with the Rochester carburetor with an automatic choke. Has always worked excellent until this summer. Starts up well after depressing accelerator but idle only lowers slightly when I depress the accelerator following start up - stays on a much too fast idle. Once driven the idle lowers to a proper level within a quarter of a mile or so. Once the idle comes down it runs smoothly and idles properly from then on. Also starts quickly without the choke throughout the day. I do not notice any vacuum leaks, so I'm thinking adjustment or cleaning. Any advice would be appreciated.