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1997 GMC C1500 Sierra SL 5.7L Poor Idle Quality, Misfire, MIL Lamp on
Posted to GM Driveability on 2/23/2009 15 Replies

The truck continues to get P0300 Multiple Random mis-fire code and shows mis-fires on cylinders 1, 3, & 5. Fuel pump has been replaced along with rotor, distributor, plugs, spark plug wires, etc. The intake gaskets were changed on the truck over 5 years ago. T...

FIX posted 3/10/2009

15 Replies Received (View Replies)

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car Vehicle Data

1997 GMC C1500 Sierra SL

Engine5.7 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
EmissionsOBD-II Compliant
SymptomsPoor Idle Quality, Misfire, MIL Lamp On

Trouble Codes

P0150Heated Oxygen Sensor (Bank 2 Sensor 1) Circuit Malfunction
P0300Multiple Misfire Detected
P0303Cylinder 3 Misfire Detected