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knock when coasting
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  1. 911 Problems Forum
    Thanks for reading my post! Last week my 07 duramax with 99K miles (powertrain warranty goes out at 100) lost power and started belching black smoke. It limped home, barely, and the next morning would crank and then go dead, more black smoke. I had it towed 35 miles to a GM dealership, and...
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