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Q: my EPC light is on and the car is throtteling would you know what this mean and on 2007 Volkswagen Passat

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(1) Answer
If the car is a petrol model, the problem is the IAC valve (Idle Air Control). This unit increases the air to the plenum chamber. If the plunger is dirty, it will need to be removed and cleaned. An hours work at the garage and it may need a new IAC valve if cleaning isn't successful.