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1999 Pontiac Grand Prix GT 3.8L Misfire, MIL Lamp on
Posted to GM Driveability on 11/3/2014 34 Replies

This car misfires on cyl's 2 & 5 (comes & goes) that starts @ 52mph or higher under steady throttle, I can watch the misfires on my scanner as well as feel it. It never misfires any other time. Previous shop replaced spark plugs, wires, coil (2 & 5 share coil)...

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  Related Documents & Media  1999 Pontiac Grand Prix GT

 
Message Closed w/FIX

car Vehicle Data

1999 Pontiac Grand Prix GT

VIN 1G2WP52K2X
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
SymptomsMisfire, MIL Lamp On
OccursCruise

Trouble Codes

P0300Multiple Misfire Detected
Message Closed w/FIX

car Vehicle Data

1999 Pontiac Grand Prix GT

VIN 1G2WP52K2X
Engine3.8 L / 6 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFuel Injection / SEFI
EmissionsOBD-II Compliant
SymptomsMisfire, MIL Lamp On
OccursCruise

Trouble Codes

P0300Multiple Misfire Detected