I have a 1977 ford f100 truck that is idling too slow or too fast.
When I start it, it idles so slow that it stalls out. Once is warms up, it idles at 25 mph and I cannot kick it down to a normal speed. I had the idle adjusted by repair shop. It did not help.
Your engine may have a vacuum leak or the choke may need adjustment and you may need to have the carburetor rebuilt.
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