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Q: Power loss, slow response when eccelerating, lose power and speed on big hills. on 2002 Volkswagen Golf TDI

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
In the warmer weather it seems to run ok but not in the cold weather. My mileage has also dropped to 25 to 32 mpg, 32+/- warm weather, 25+/- cold weather. It's also slow to start when the temp drops below 40 deg.
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