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There are a number of causes. A good approach is to buy/borrow a Code Reader (ODBC-II) and see what errors the car's computer reports. Some auto parts stores will read your codes for free. Then, search the internet for that fault code and your year/make/model. You'll probably find the answer quickly.

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Q: What could cause a lean condition and random misfire in a 2001 jetta 1.8t?
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