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2005 Mercedes-Benz C240 4MATIC Question: DTC code P0174. What are the likely causes based on the following symptoms?

 

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bmelke, Kingston, NY, September 12, 2013, 10:02
 Rookie

The car has problems starting, specially when warm. Sometimes idle level too low, this gets worse the longer the car runs. Sometimes pressing the gas pedal does not obtain an immediate response, pressing the gas pedal slowly seems to solve the problem. I have checked the vacuum seal on the exhaust.

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