its NOT the knock sensor......
tell him to disconnect the knock sensor harness (back of intake manifold), this will set a knock code and retard the shit out of the timing, but it wont cause a misfire.....
tell him he is a fucking moron and pick your truck up, then call GM directly, ask them where to take it for your warranty work because you do not want that service department working on it again.
sounds like the tech just doesnt know his shit, because false knock will not cause a misfire, real knock could possibly, but "if" he is blaming the headers causing false knock then whats up with the misfires? his story doesnt hold up.....
might i ask what dealership this is and what the tech's name was? i know quite a few people in the industry.
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