Question about Pontiac Firebird

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My 1995 Pontiac firebird (3.4L V-6 Automatic) sputters when load is applied to the motor (slow acceleration) between 1500 and 2200RPM. Above 2200 rpm the car does not bog much at all. From a take off at dead stop the vehicle also bogs down considerably and there is a noticeable loss of power. Removal of the spark plugs show plugs 4, 3, and 5 as black or over carboned, with a distinct smell of gasoline coming from the exhaust system. Suspect coil pack but at this time I have not been able to get a meter to check resistance for these issues. TPS sensor, IAT Sensor and IAC Valve have been replace and the plugs have 200 miles on them.

Posted by jack_savage on

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Ricky Peters

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Check fuel pressure regulator for fuel laying in the vacuum line going to the regulator.If it has fuel in it replace regulator. If its ok then check fuel pressure if its not within specs replace pump.

Posted on Apr 27, 2011

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