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2004 Pontiac Grand Prix GTP 3.8L Poor Idle Quality, Misfire
Posted to GM Driveability on 3/17/2010 8 Replies

Misfire on #4 and #3 cylinders at idle, cuts in and out under load. Have replaced plug wires, plugs, smoked the vacuum system, replaced coil packs and module, had the injectors checked and cleaned, checked compression, and fuel pressure-all within specs. #4 mi...

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Message Closed w/FIX

car Vehicle Data

2004 Pontiac Grand Prix GTP

VIN 2G2WR52404
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire
OccursAlways
Misc.Super Charged
Message Closed w/FIX

car Vehicle Data

2004 Pontiac Grand Prix GTP

VIN 2G2WR52404
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire
OccursAlways
Misc.Super Charged