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The car runs great except when the weather gets wet. Then it stalls out as soon as I put it in gear. It also is more apt to stall out when the gas tank gets low. This has been a chronic, progressive problem. Whenever I take it to the mechanic, the skies clear and the sun comes out, and I hear from them that there is nothing wrong. I'm not crazy! Anyone have an idea as to what can be done?

Thanks.
Joe