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So I have a 2005 LLY Duramax crew cab and I’m new to the Duramax diesel world and I’ve only owned the truck since October 2019 til now and the truck just turned over 205k miles. Now my question is, would a leaking injector return line cause injector knock? The passenger side, #7 injector, return line is leaking. And when I drive the truck, it’s really clattering bad past 1/4 throttle. Sometimes it will spit and sputter past a 1/4 throttle like it’s not getting enough fuel or something and then puffs of white smoke come out the exhaust. Any help would be much appreciated! Thanks!!
 

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Leaking return line won't likely cause that.You may have a problem with injector wiring.Lly engines have problems with injector plug pigtails especially 2 and 7 and that will cause issues like that

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