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What is the problem when engine light switchs on and revs are very low at idle a 2000 focus?

Potential Causes:

- Vacuum leak

- Faulty Idle Air Control (IAC) valve

- Dirty throttle body

- Faulty oxygen sensor

- Fuel injector issue

- Faulty spark plugs or ignition coils

- Clogged catalytic converter

- Computer (PCM) malfunction