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How many miles are you driving and is it really worth to run on non-diesel fuel? It's one thing to kill a 6.2 diesel IP, I wouldn't be chancing it with more expensive Duramax parts. Just seems like with all the work and extra steps to get fuel, you are taking big chances for little gain. I...

Need history of truck/fuel system. Could be an IP failing or improperly calibrated, bad injector, etc. My new IP in a stock tune will not blow any black smoke unless it is in cold/advance mode and I mat the skinny, then I get a tiny bit of particulate. I would safely assume you should only get...