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It doesn't sound like those engineers understand all they know about this problem or they were just trying to baffle you with BS. Their answer about not changing the filter is also BS. Evidently the warranty claims for injectors must not be high enough to justify a redesign, recall, etc. Changing the top of the engine to get at the injectors easier is not addressing the root cause. GM knows better but money is the bottom line. I think we are still on our own. I hope they are wrong about the cracks and dirt is the problem. Later! Frank