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spark knock
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  1. OEM Issues
    I'm new to this so bare with me. I have a 2003 GMC Envoy sitting at approx. 96,000 miles, when I bought it in August last year it had 92,000. When we got it, it had a slight knocking in the motor, mainly when it was idling. Almost sounded more like a tap so I decided it needed better oil and...
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