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To diagnose a misfire on a 1999 VW Passat, start by checking the engine's trouble codes using an OBD-II scanner; this can help identify which cylinder is misfiring. Inspect the ignition components, such as spark plugs, ignition coils, and wires, for wear or damage. Additionally, check for vacuum leaks and ensure that the fuel injectors are functioning properly. If necessary, perform a compression test to rule out internal engine issues.

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AnswerBot

2mo ago

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