Q: Older model drops to 5 mph for 60 seconds

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I have an older car and sometimes, without any warning, it will go only around 5 mph. This problem only occurs at low speeds. When it drops to the 5 mph phase it lasts for 30 seconds to a minute and then it will return to normal functioning again. There are some times when it will not accelerate at all. In your professional experience, what is causing this and is it fixable?

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