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Discussion Starter · #1 ·
Need your help guys I have a 06 gmc Duramax built motor at past weekend truck pull it started popping at 3k rpms and is very hard to get started usually takes about 5 minutes of cranking to get started, I have no codes besides glow plugs due to being deleted. Truck has always started pretty easy till this last pull when it started popping.
 
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