Pontiac Problems? Ask a Mechanic for Answers ASAP
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This is usually caused by a failing mass airflow sensor.....You can try to clean it first with approved cleaner from parts store if that doesnt help pull the vacuum line off the fuel pressure regulator, if fuel comes out replace...If not I'd replace mass airflow sensor.
P0172 Fuel Trim System Rich (Bank 1) - With Automatic Transmission