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there is two issues that you will see posted on the net with smoke on a LBZ motor the first and most common is the EGR sticking and it blows blue/wht smke after idleing once in a while. Mines done it maybe 10 times not a issue if it happends. The other smoke issue is gray smoke while on the power hard , again normal. I really would want to know why your truck needed injectors , its not a common problem since the LLY motor came out in 2005 1/2. the lly had wireing issues that where called " injector problems" but very few needed injectors. If its fixed dont give it a second thought but I would find a differnt dealer for service work , I dont think they told you the truth......
 
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