lack of power

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    2002 Pontiac Sunfire lack of engine power.

    Please fill out the following to ask a question. MAKE: Pontiac MODEL: Sunfire SE YEAR: 2002 MILES: 135,081 ENGINE: 2.2L OHV Vin 4 DESCRIBE ISSUE.... Engine is lacking power while accelaration. I just had fuel pump replaced less than 2 weeks ago due to DTC P0171 code. After pump was changed, car...