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What would make 1998 volkswagen jetta only fire as your letting off the key switch?

- Worn or damaged ignition switch

- Faulty ignition coil

- Weak battery

- Clogged fuel filter

- Defective fuel injector

- Vacuum leaks

- Faulty oxygen sensor

- Blocked catalytic converter

- Failing throttle position sensor

- Problems with the Engine Control Module (ECM)