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  1. Cold Engine Spark Knock On Acceleration 3800 Series 3

    DTC's, Problems & Troubleshooting
    I have a 2007 Grand Prix GT, and I have had issues with a rattling spark knock type sound when accelerating while the engine is cold for quite some time. When I purchased the car in 2015, it had a bad spark knock problem to the point I ran premium grade fuel. Not long after purchase, I replaced...
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